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
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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
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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