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
Had you followed the doctor's advice, you would be much better now. But you ______.
A. don't
B. haven't
C. hadn't
D. didn't
单项选择题
Doing homework ______ most of the children's spare time, so they have little time to play.
A. gives up
B. takes up
C. puts up
D. brings up
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