单项选择题

I'm tired out. I ______ all afternoon and I don't seem to have finished anything.

A. shopped

B. have shopped
C. had shopped

D. have been shopping

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单项选择题

I have to delay（）the letter.

A.to answer
B.answering
C.answer
D.answered

单项选择题

No sooner had he finished his talk______he was surrounded by the workers.

A. as

B. then

C. than

D. when

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