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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单项选择题
The fishing boat ______ on the beach.
A) hang about
B) hang on
C) hang up
D) hang back
单项选择题
It is reported that there in no better ______ for human's hands.
A) alternative
B) equivalence
C) exchange
D) substitute
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