单项选择题

The 1986 Challenger space-shuttle ______ was caused by unusually low temperatures immediately before the launch.

A. expedition
B. controversy
C. dismay
D. disaster
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单项选择题
It is necessary that an efficient worker ______ his work on time.
A. accomplishes
B. can accomplish
C. accomplish
D. has accomplished
单项选择题
______, she led a life of complete seclusion.
A. Being disgraced
B. Disgraced
C. Disgracing
D. She was disgraced
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