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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单项选择题
The students（）their papers by the end of this month.

A、 have finished
B、 will be finishing
C、 will have finished
D、 have been finishing
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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