单项选择题

The building around the corner caught fire last night. The police are now （） the matter.

A. seeing through
B. working out
C. looking into
D. watching over

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单项选择题
（） catching the fever himself the man kindly carried the sick child home.

A. A head of
B. At the sight
C. At the risk of
D. By way of
单项选择题
He is stupid. （） , he doesn't study.

A. In the first place
B. In other words
C. To be honest
D. To make matters worse
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