单项选择题

There was too much dust that we couldn’t see what was happening.

A．There
B．too
C．couldn’t
D．what
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单项选择题
He finds it easier to do the cooking himself than teaching his wife to cook.
A．it
B．cooking
C．teaching
D．to cook
单项选择题
Factory workers had to work very hard before, so had farmers.
A．had to
B．very hard
C．so
D．had farmers
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