—Ididn'tseeyouatthebeginningofthepartylastnight.—I
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问题详情:
—I didn't see you at the beginning of the party last night.
—I _____ on my biology report at that time.
A. worked B. work . C. was working D. am working
【回答】
C
知识点:过去进行时及其被动式
题型:选择题
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