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
The boy was so ______ on his stamp collection that he did not hear my footsteps.
A．absorbed
B．engrossed
C．engaged
D．intent
单项选择题
The congress, by a two-third vote in each house, may ______ an amendment to the Constitution.
A．start
B．initiate
C．begin
D．propose
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