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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单项选择题
Helen apologized for ______ to attend the party.
A．her not being able
B．her being not able
C．her to be not able
D．her not to be able
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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