单项选择题

I'll stick ______ the task until it is completed.

A．at
B．to
C．on
D．in
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单项选择题
He ought to have handed in the paper yesterday. That's what he ______.
A．should do
B．should be doing
C．should have done
D．should
单项选择题
After succeeding ______ round Cape Horn, he sent a message to London.
A．sailing
B．to sail
C．in sailing
D．on sailing
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