单项选择题

It was suggested that the agreement ______ before the end of the year.

A．be signed
B．was signed
C．would be signed
D．had been signed
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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
单项选择题
Finally, the thief handed everything ______ he had stolen to the police.
A．which
B．what
C．whatever
D．that
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