单项选择题

I'm afraid the coffee I spilt will make a ______ on the tablecloth.

A．mark
B．speckle
C．stain
D．dot
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单项选择题
Our Math teacher must be in his office now. No, he ______ be there. I saw him in the library a minute ago.
A．can't
B．couldn't
C．mustn't
D．wouldn't
单项选择题
Entering the reading room of the library, ______ reading there, preparing for their final exams.
A．a lot of students were
B．Tom found a lot of students
C．a lot of students
D．a lot of students were found by Tom
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