单项选择题

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

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

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单项选择题
The flowers are dead. I（）them more water.

A. would have given
B. will give
C. should have given
D. must give
单项选择题
They desire that the tour leader（）them immediately of any change in plans.

A. informs
B. informed
C. inform
D. has informed
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