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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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
单项选择题
The popularity of the novel proves that some criticism against it is ______.
A．improved
B．misguided
C．unreasonable
D．unjustified
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