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
Theteacherdoesn'tallowhisstudents（）ontheexam.

A．cheated
B．cheating
C．cheat
D．to cheat
单项选择题
Wearesometimes（）ofselfishnessinourlives.

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