单项选择题

The boxer ______ his opponent as hard as he could.

A．punched
B．whipped
C．slapped
D．knocked
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单项选择题
Petrol is manufactured from the ______ oil we take out of the ground.
A．crude
B．raw
C．rough
D．tough
单项选择题
The size of the audience, ______ we had expected, was well over one thousand.
A．whom
B．who
C．as
D．that
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