单项选择题

All students （） a loud laugh when professor Henry Mitchel told them the joke.

A. let off
B. let down
C. let out
D. let up

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I prefer the climate in Kunming to（）in Wuhan.

A. one
B. those
C. the one
D. that

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If you（）see Mr. Jim, you give him my regards.

A. would
B. shall
C. should
D. will

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