单项选择题

The child hid himself behind his mother's skirt, ______ he was afraid of the dog.

A. for
B. and
C. but
D. or
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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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______ 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
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