单项选择题

The mail was ______ for a week because of the flood.

A．held in
B．hold on
C．hold off
D．hold down
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单项选择题
The Chinese people will never forget those foreign friends, who ______ down their lives for the cause of the liberation of 4hina.
A．has laid
B．had laid
C．laid
D．would have laid
单项选择题
The teacher rather than the students ______ the mistakes.
A．is responsible for
B．are responsible for
C．is responsible to
D．are responsible to
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