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
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单项选择题
He ______ his son by giving him too much money.
A．damaged
B．hurt
C．spoiled
D．harmed
单项选择题
My wallet is nowhere to be found. I ______ when I was on the bus.
A．must have dropped it
B．must drop it
C．should have dropped it
D．ought to have dropped it
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