单项选择题

I'm afraid I've taken ______ too much of your time.

A．up
B．after
C．in
D．back
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单项选择题
I regret ______ so much time and money on stamps.
A．to waste
B．for wasting
C．having wasted
D．at wasting
单项选择题
She is making herself iii with ______ over her son's future.
A．troubles
B．annoyance
C．worry
D．consideration
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