单项选择题

The pupils said that a number of questions ______ too difficult.

A．are
B．is
C．were
D．was
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单项选择题
The engine didn't stop because the fuel was finished.
A．引擎不是因为燃料耗尽而停止运转。
B．引擎停止运转是因为燃料耗尽。
C．引擎不是因燃料结束而停止运转。
D．引擎不停是因为燃料已经被结束。
单项选择题
He was praised for ______ such a contribution to the country.
A．make
B．to make
C．to making
D．having made
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