单项选择题

Road conditions in this area had gone from bad to worse. Accidents had taken place ______ before the strict measures were taken.

A. by the way
B. in a row
C. in the way
D. in a line
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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
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
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