单项选择题

To cry over spilled milk is to cry（）

A．in a vain
B．in the vain
C．in vain
D．in no vain

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单项选择题
To be（）I couldn’t understand what he was getting at. If you wanted to know you’d better ask someone else.

A. sly
B. humble
C. honest
D. cowardly
单项选择题
Her lecture gave us a sense of how empty the universe is, in spite of ______ number of stars within it.
A. varying
B. enormous
C. unusual
D. limited
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