I__for information for my essay over the last week.A.search B.have been searching C.searched D.had been searching

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I__for information for my essay over the last week.A.search B.have been searching C.searched D.had been searching

I__for information for my essay over the last week.A.search B.have been searching C.searched D.had been searching
I__for information for my essay over the last week.
A.search B.have been searching C.searched D.had been searching

I__for information for my essay over the last week.A.search B.have been searching C.searched D.had been searching
B
【over the last + 时间段】 是现在完成时,现在完成进行时的标志性状语