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
It is reported that an oil tanker has sunk ______ the coast of Osaka, Japan.
A．on
B．along
C．off
D．at
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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