单项选择题

A good many houses ______ knocked down by the earthquake.

A．was
B．were
C．is
D．are
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单项选择题
Be here on Friday ______ the latest.
A．at
B．by
C．for
D．in
单项选择题
As teachers we should concern ourselves with what is said, not what we think ______.
A．ought to be said
B．must say
C．have to be said
D．need to say
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