单项选择题

You must follow the directions exactly, and if you become confusing, you must take the time to go back again and read them over.

A．exactly
B．confusing
C．the time
D．them
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Although I expected something different, I was still, surprised by which he said.
A．Although
B．different
C．still
D．which
单项选择题
The principal reason for the great number of smoke is that there are too many factories in this area.
A．principal
B．number
C．that
D．too many
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