单项选择题

We found ______ necessary to protect the environment.

A. it

B. this

C. that
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单项选择题
We are doing much better ______ English ______ our teacher’s help.
A. in; at
B. at; in

C. in; with
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Hundreds of ______ come to visit Chinese every year.
A. person

B. travellers
C. Japaneses
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