单项选择题

There’s a man at the reception desk who seems very angry and I think he means （） trouble.

A. making
B. to make
C. to have made
D. having made

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单项选择题
I’d rather read than watch television; the programs seem （） all the time.

A. to get worse
B. to be getting worse
C. to have got worse
D. getting worse
单项选择题
Some people viewed the findings with caution, noting that a cause-and-effect relationship between passive smoking and cancer remains （）.

A. to be shown
B. to have shown
C. to have been shown
D. being shown
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