单项选择题

As a young man, Tom used to () in the town,()to find a job for a few coins.

A．knocking about; waited
B．knocked down; waiting
C．knock about; waiting
D．knocked down; waited

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单项选择题
It takes () very unusual mind to undertake ()analysis of () obvious.

A．a; /; the
B．a; the; the
C．/; the; /
D．/; the; the
单项选择题
All()is needed is a supply of oil.

A．the thing
B．that
C．what
D．which
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