单项选择题

Living in the desert of Africa has its problems; ______ obtaining fresh water is not the least.

A．with which.
B．for which
C．of which
D．which
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单项选择题
Once the problem of the engine ______, all other problems will be readily solved.
A．solve
B．solved
C．is solved
D．will be solved
单项选择题
Tom and Lily have arrived, but______ students of the class are not here yet.
A．other
B．others
C．the other
D．the others
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