单项选择题

Although he thought he was helping us to prepare the dinner, he was actually______ the way.

A．in
B．off
C．by
D．on
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单项选择题
All flights ______because of the snowstorm, we decided to take the train instead.
A．were canceled
B．had been canceled
C．having canceled
D．having been canceled
单项选择题
The oil must be used up,______ the light went out.
A．since
B．as
C．because
D．for
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