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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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
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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