单项选择题

His illness made him ______ of concentration.

A．incompetent
B．unable
C．incapable
D．powerless
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单项选择题
Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．for which
B．to which
C．of which
D．in which
单项选择题
We advised them to take a rest, but they ______ on finishing the work.
A．suggested
B．continued
C．insisted
D．persisted
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