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
Had it not been for my illness, I ______ him a helping hand.
A．had lent
B．were to lend
C．would have lent
D．should lend
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