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 cried（）my voice, but still they could not hear me.

A. at top of
B. at the top of
C. on the top in
D. to the top of
单项选择题
Every year a flood of farmers arrive in Shenzhen for money-making jobs they（）before leaving their hometowns.

A. promised
B. were promised
C. have promised
D. have been promised
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