单项选择题

"I'm too tired, but let's go.""Why（）rest a while?"

A.don't we
B.not let's
C.not we
D.let's not

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Had electronic computers not been invented, many problems of space flight（）now.

A. could not have been solved
B. could not be solved
C. must not be solved
D. should not have been solved
单项选择题
March is the third month of（）

A.a year
B.year
C.years
D.the year
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