单项选择题

All children（）a loud laugh when their father told them the funny story.

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

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If I had enough money now, I（）buy a car.

A. would
B. shall
C. might
D. would have

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There is no doubt（）Herbert is the most industrious student in our class.

A. whether
B. what
C. that
D. if

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