单项选择题

______ man must fear when traveling in space is radiation from the sun.

A. Which
B. How
C. What
D. That
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单项选择题
______ a car reaches the end of its life, it is taken apart and any part that can be reused is sold off.
A. As
B. With
C. Once
D. While
单项选择题
______ , I'll wait for you to have dinner together. Be back as early as possible.
A. However late it is
B. No matter how it is late
C. However it is late
D. No matter how late is it
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