单项选择题

You may borrow the book （） you keep it clean.

A. such as
B. so as to
C. so long as
D. as for

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单项选择题

（） he works hard, I don’t mind when he finishes the experiment.

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

单项选择题

A man escaped from the prison last night. It was a long time （） the guards discovered what had happened.

A. before
B. until
C. since
D. when

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