单项选择题

Some researchers feel that certain people have nervous systems particularly ______ to hot, dry winds. They are what we call weather-sensitive people.

A. subjective
B. subordinate
C. liable
D. vulnerable
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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
______, please feel free to write to me.
A. Shall you need any further information
B. Should you need any further information
C. Will you need any further information
D. Would you need any further information
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