单项选择题

From thousands of kilometers above our earth, a communications satellite ______ a signal from one side of the world and relays it directly to the other.

A. receives
B. accepts
C. admits
D. offers
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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
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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