单项选择题

It’s cold outside. You’d better ______ your coat.

[A] to put on
B. put on
C. take off
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单项选择题
Who took part in the study
[A] Teachers and parents.
B. Students and their teachers.
C. Students and their parents.
单项选择题
Tom’s mother kept telling him that he should work harder, but______didn’t work.
[A] he
B. it
C. which
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