Alice, you were supposed ________ your paper last Sunday. Why haven't you finished it yet?

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• 1-What did you hear last night?-I seemed_________ someone knock at the door.     

  A.to be heard

  B.to be hearing

  C.to have heard

  D.having heard

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• 2The man we followed suddenly stopped and looked as if ______ whether he was going in the right direction.

  A.seeing

  B.having seen

  C.to have seen

  D.to see

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• 3According to the companies' websites, the number of active QQ users in China has reached 1 billion, while Qihoo 360 also claims _______ at least 300 million users before June 2010.

  A.to have

  B.to have had

  C.having

  D.having had

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• 4______ the exams to worry about, I have to work really hard this weekend.

  A.As

  B.For

  C.With

  D.Because of

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• 5Earth is believed ____ by an object the size of Mars at some point in the distant past before its surface cooled.

  A.to be hit

  B.to have hit

  C.to have been hit

  D.to hit

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• 6This book is said ________into several foreign languages last year.

  A.has been translated

  B.have been translated

  C.to have translated

  D.to have been been translated

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• 7The split between humans and living apes is thought by some scholars _____ 15 to 20 million years ago.

  A.to occur

  B.occurring

  C.to have occurred

  D.having occurred

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• 8China is known _____ greatly in terms of its cultural values over the past few years.

  A.to change

  B.having changed

  C.changing

  D.to have changed

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• 9All the books donated by the students from urban schools are said _____ to the students in rural areasthe other day.

  A.to be sent

  B.being sent

  C.having been sent

  D.to have been sent

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• 10This book is said _____ into several foreign languages last year.

  A.has been translated

  B.have been translated

  C.to have translated

  D.to have been translated

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