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
Please note that I will be away from Boston next week, ______ you want to call me and discuss things.
A．in case
B．unless
C．until
D．so that
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