单项选择题

He won the scholarship. He ______ hard these terms.

A. should have worked
B. must have worked
C. must have been working
D. could have worked
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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
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
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