单项选择题

The chair is not comfortable to sit in. It needs ______.

A．adjust
B．adjusting
C．adjusted
D．be adjusting
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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
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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