二：语法和词汇知识（共20小题，每小题1分，满分20分）。6

二：语法和词汇知识（共20小题，每小题1分，满分20分）。
6._________we must keep in mind is that we must protect water and use it wisely.

A．Why

B．What

C．Where

D．How

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C．solved; should agree

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A．referred is

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