单项选择题

It wasn’t a good thing; _____, it was a huge mistake.

A．on the whole
B．on the contrary
C．on the average
D．on the other hand
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单项选择题
With a total of 1,300 million people, China is one of the most densely _____ countries in the world.
A．populated
B．polluted
C．crowded
D．concentrated
单项选择题
The poor old man was _____ yesterday when he was crossing the street.
A．run into
B．run out
C．run over
D．run through
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