单项选择题

They must ______for us; let's hurry up.

A．wait
B．have been waited
C．waited
D．be waiting
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单项选择题
The old couple were not rich themselves, but they hated to turn away anyone who were ______food and shelter.
A．at the mercy of
B．on the point of
C．with the exception of
D．in need of
单项选择题
Living in the central Australian desert has its problems, ______obtaining water is not the least.
A．of which
B．for what
C．as
D．whose
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