单项选择题

Water enters into a great variety of chemical reactions, （）have been mentioned in previous pages.

A. a few of it
B. a few of them
C. a few of that
D. a few of which

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单项选择题
The streets are all wet. It（）during the night.

A. must be raining 
B. must have rained 
C. had rained     
D. must rain
单项选择题
（） would you solve the problem if this method failed

A. What else
B. How else
C. How little
D. How else
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