单项选择题

I'm sure the letter won't arrive in time ______ it is sent by air.

A．if
B．until
C．because
D．unless
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单项选择题
Finally, the thief handed everything ______ he had stolen to the police.
A．which
B．what
C．whatever
D．that
单项选择题
The manager has got a good business ______ so the company is doing well.
A．idea
B．sense
C．thought
D．thinking
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