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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Putting in a new window will ___________ cutting away part of the roof.
A．include
B．involve
C．contain
D．comprise
单项选择题
Everybody ___________ in the hall where they were welcomed by the secretary.
A．assembled
B．accumulated
C．piled
D．joined
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