单项选择题

The riot is said () by the government’s negligence of the people’s welfare.

A. to have been caused
B. being caused
C. to be caused
D. to cause

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If I () the exam, he would be astonished.

A. did pass
B. pass
C. were to pass
D. had passed
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I’m going to have my letters () tomorrow.

A. type
B. typing
C. typed
D. to be typed
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