Reports showed that it was not the first time this state-owned firm ________ serious accidents. A.has happened B.had happened C.has experienced D.had experienced
Why he did not arrive on time was that he ________ and it was too late to catch the early bus. A.was oversleeping B.has overslept C.overslept D.had overslept
Song Wenbo, who is said to have sacrificed his own life to save other people, ________ in Hengyang No.8 Middle School for three years. A.studied B.have studied C.was studying D.had studied
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