单项选择题

He felt helpless in a situation ______ he could not move himself.

A．where
B．which
C．that
D．while
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单项选择题
A．fallsB．arrivesC．dropsD．happens
A．falls
B．arrives
C．drops
D．happens
单项选择题
The children prefer camping in the mountains_________an indoor activity.
A．to
B．than
C．for
D．with
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