单项选择题

One of the guards ______ when the general came in, which made him very angry.

A．has slept
B．were sleeping
C．slept
D．was sleeping
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单项选择题
It's high time we ______ something to stop traffic accident.
A．do
B．will do
C．did
D．must do
单项选择题
We were delighted to find the trees planted a year before ______ very tall.
A．growing
B．being grown
C．having been growing
D．grown
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