单项选择题

Suddenly he heard someone ______ gently on the window.

A．knock
B．knocking
C．knocked
D．to knock
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单项选择题
She reminded me that Columbia ______ the capital of Ohio.
A．were
B．was
C．is
D．would be
单项选择题
Neither of us ______ to undertake the responsibility.
A．were wanting
B．wants
C．want
D．have wanted
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