单项选择题

—Excuse me, look at the sign NO SMOKING!
—Sorry, I ______ it.

A. don’t see
B. didn’t see
C. haven’t seen
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He walked ______ fast for us ______ catch up with.
A. so; that
B. enough; to
C. too; to
单项选择题
We found ______ necessary to protect the environment.
A. it

B. this

C. that
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