单项选择题

It is (necessary) that she (comes) here twice a week (to help) (do) the housework.

A．necessary
B．comes
C．to help
D．do
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单项选择题
We should recognize that every company and every person is part of a long ______ of customers and suppliers.
A．pool
B．line
C．stream
D．chain
单项选择题
—You are so lucky.—What do you mean ______ that
A．for
B．in
C．of
D．by
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