单项选择题

Living in the desert involves a lot of problems, （） water shortage is the worst.

A. not to mention
B. of which
C. let alone
D. for what

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单项选择题
The government official can hardly find sufficient grounds （） his arguments in favor of the revision of the tax law.

A. on which to base
B. which to be based on
C. to base on which
D. on which to be based
单项选择题
（31）（）

A. When
B. While
C. If
D. As
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