单项选择题

His use of technical terms let his audience（）

A. confusing
B. confused
C. with confusion
D. to confusion

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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
单项选择题
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
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