单项选择题

A taxi doesn't run as ______ as an underground train.

A． fast
B． faster
C． fastest
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单项选择题
Though they had cleaned the floor, there was still ______ rice on it.
A． a few
B． few
C． a little
单项选择题
The classroom must ______.
A． be kept clean
B． keep cleaned
C． kept clean
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