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．lot of students were found by Tom
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单项选择题
If you are constantly looking back,______pretty good you will fall into a hole ahead.
A．it is
B．there is
C．chances are
D．possibilities are
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
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