单项选择题

There is ______ "s" in the word" smile".

[A] a
B. /
C. an
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单项选择题
This is a book ______ sports.
[A] in
B. on
C. for
单项选择题
When they got to the cinema, the play ______ for half an hour.
A. has begun
B. had begun
C. had been on
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