单项选择题

—Would you like to come to dinner tonight
—I'd like to, （）I'm too busy.

A. and
B. so
C. as
D. but

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单项选择题

My handkerchief must be（）but I can't find it.

A. anywhere
B. where
C. somewhere
D. nowhere

单项选择题

This method, （）in the area near Shanghai, resulted in a market rise in total production.

A. trying
B. tried
C. was tried
D. has been tried

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