单项选择题

He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't been well for some time now.

A．worked off
B．worked on
C．worked out
D．worked at
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单项选择题
The letter was closely written in pencil, and in some part hardly _______.
A．legible
B．literary
C．legal
D．legitimate
单项选择题
During the famine of 1943, millions of Chinese peasants _______ to the cities because they could not survive in the rural areas.
A．migrated
B．mobilized
C．navigated
D．transferred
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