单项选择题

They will not start the project until the board chairman ______ back from South Africa.

A．will come
B．is coming
C．came
D．comes
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单项选择题
Jack would rather spend time complaining than ______ the problem by himself.
A．solve
B．solved
C．solves
D．to solve
单项选择题
I tried to get out of the business ______ I found impossible to carry on.
A．why
B．which
C．what
D．where
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