单项选择题

Scarcely ______ when it began to rain.

A. did he return

B. had he returned
C. he did return

D. he had returned

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单项选择题

______ he works hard, I don’t find when he finishes the experiment.

A. As soon as B. As well as
C. So long as
D. So far as

单项选择题

When I caught him ______ me, I stopped buying things there and started dealing with another shop.

A. cheating

B. cheat
C. to cheat

D. to be cheating

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