单项选择题

Tom tried his best to keep awake, but the performance was so boring that he couldn't help to sleep.

A．dropping off
B．dropping down
C．dropping away
D．dropping out
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单项选择题
Jane is completely under her husband's ______.
A．palm
B．finger
C．thumb
D．fist
单项选择题
______ for the timely warning from the local weather station, our hut would not be so safe as it is.
A．Be it not
B．Should it not be
C．Had it not been
D．Were it not
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