单项选择题

--The cars give off a great deal of waste gas in the streets. --Yes. But I'm sure something will be done to ______ air pollution.

A．reduce
B．remove
C．collect
D．warn
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单项选择题
Yesterday, Jane walked away from the discussion. Otherwise, she ______ something she would regret later.
A．had said
B．said
C．might say
D．might have said
单项选择题
-- Oh, it's you! I ______ you. --I've just had my hair cut, and I'm wearing new glasses.
A．didn't recognize
B．hadn't recognized
C．haven't recognized
D．don't recognize
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