单项选择题

He will never seem to be successful,（）hard he tries because no one is supporting him.

A．however
B．whenever
C．wherever
D．whatever

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单项选择题

The thought came to him（）maybe the enemy had fled the city.

A．which
B．as
C．when
D．that

单项选择题

He checked his car carefully lest it（）on the way.

A．breaks down
B．broke down
C．would break down
D．should break down

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