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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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
单项选择题
At the later stage of development, there ______ new problems which first seemed insoluble.
A．rose
B．arose
C．resulted
D．happened
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