单项选择题

When the ship was caught in a strong storm at the sea, the captain ______ a danger signal.

A．sent for
B．sent off
C．sent out
D．sent around
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单项选择题
I know it's not important but I can't help ______ about it.
A．to think
B．thinking
C．and think
D．being thought
单项选择题
They ______ on a trip into the desert the following year.
A．set in
B．sent for
C．set off
D．sent off
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