单项选择题

The earth revolves a little more rapidly ______ it is closer to the sun.

A．whether
B．whereas
C．although
D．when
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单项选择题
He ______ to your home, for he doesn't know your address.
A．can't have been
B．mustn't have been
C．shouldn't have been
D．needn't have been
单项选择题
Before taking such a test, one had better ______ his or her vocabulary.
A．outline
B．translate
C．revise
D．brush up
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