单项选择题

She didn't know ______ to express her ideas clearly when she was invited to speak at a meeting.

A．where
B．why
C．what
D．how
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单项选择题
It cost her a lot of money，but she doesn’t regret______a year traveling around the world．
A．to have spent
B．to spend
C．spent
D．spending
单项选择题
The policeman saw the thief ______ he appeared on the street comer.
A．not until
B．as long as
C．the moment
D．only if
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