单项选择题

（） at the school, a car picked him up to an unknown place.

A．While arriving
B．Having arrived
C．When he arrived
D．On its arrival

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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
单项选择题
Some of the advice has been （） as they are quite impracticable.

A．turned out
B．turned on
C．turned in
D．turned down
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