单项选择题

We are sometimes ()of selfishness in our lives.

A. miserable
B. greedy
C. guilty
D. sorry

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单项选择题

There is a lot of evidence () stress is partly responsible for the disease.

A. what
B. which
C. as
D. that

单项选择题

The teacher doesn’t allow his students ()on the exam.

A. cheated
B. cheating
C. cheat
D. to cheat

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