单项选择题

He doesn't seem to be able to do it, ______ I thought he could.

A． though
B． since
C． if
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单项选择题
When the bell rang, the teacher told the class ______.
A． stop to talk
B． stop talking
C． to stop talking
单项选择题
— Do you mind if I use your book for a while
A． Yes, please
B． No, thanks
C． Of course not
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