单项选择题

As 2 is to 4, ______ 4 is to 8.

A. as
B. so
C. that
D. which
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单项选择题
It's Sunday today. You ______ school.
A. didn't need to go to
B. needn't have gone to
C. mustn't go to
D. couldn't go to
单项选择题
Whenever I have an appointment, I like to arrive______.
A. ahead of time a little
B. a little time
C. a little ahead of time
D. ahead of a little time
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