单项选择题

Paul doesn't have to be made______. He always works hard.

A．learn
B．to learn
C．learned
D．learning
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单项选择题
One day they crossed the ______bridge behind the palace.
A．old Chinese stone
B．Chinese old stone
C．old stone Chinese
D．Chinese stone old
单项选择题
—You were brave enough to raise objections at the meeting. —Well, now I regret ______that.
A．to do
B．to be doing
C．to have done
D．having done
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