单项选择题

Living in the western part of the country 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
Mr. Brown’’s condition looks very serious and it is doubtful if he will_______.
A．pull back
B．pull up
C．pull through
D．pull out
单项选择题
A．howeverB．neverthelessC．soD．therefore
A．however
B．nevertheless
C．so
D．therefore
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