单项选择题

The teacher told us that we didn't have to () every new word we ran into when reading.

A. look over
B. look after
C. look up
D. look for

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单项选择题It's () you to make a decision on this issue.

A. up to
B. according to
C. due to
D. thanks to

单项选择题If you have any problem, you can () professor Li for advice.

A. turn up
B. turn in
C. turn to
D. turn down