单项选择题

Scientists should be kept ______ of the latest developments in their research areas.

A．inform
B．informing
C．informed
D．to inform
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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
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
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