单项选择题

The sun heats the earth, （） is very important to living things.

A. that
B. what
C. which
D. as

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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
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
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