单项选择题

The time will come ______ man can fly to ______ he likes in the universe.

A. how…where
B. when…wherever
C. where…where
D. what…which
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单项选择题
They failed to pass the exam last time, I regretted ______.
A. to be not able to help
B. being unable to help
C. being not able to help
D. not be able to help
单项选择题
When they had finished playing, the children were made to ______ all the toys they had taken out.
A. put out
B. put off
C. put up
D. put away
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