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
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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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