单项选择题

The clock ______ and we realized it was two o'clock.

A．hit
B．struck
C．knocked
D．rang
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单项选择题
Suddenly he heard someone ______ gently on the window.
A．knock
B．knocking
C．knocked
D．to knock
单项选择题
Mr. Johnson preferred ______ heavier work to do.
A．to be given
B．to be giving
C．to have given
D．having given
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