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

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单项选择题
The teacher doesn’t allow his students ()on the exam.

A. cheated
B. cheating
C. cheat
D. to cheat
单项选择题
She insisted that the seats()in advance.

A. booked
B. be booked
C. are booked
D. were to book
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