A) is working
B) has worked
C) will work
D) will have worked
A. Had you come B. Did you come
C. Have you come D. Should you come
A. only B. almost C. me'rely D. hardly
A. suppose B. assume C. assure D. grant
A. in exchange B. instead C. in return D. in particular
A. Watching B. Watch C. Watched D. Having watched
A. it is B. is it C. it is that D. is it that
A. the driver can be B. can the driver be
C. the driver be D. be the driver
A. having not been invited B. not having been invited
C. not to be invited D. to be not invited
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