【題目】We need clear air and water, so we _____ protect the environment.
A.can
B.may
C.must
D.might

【答案】C
【解析】句意:我們需要清潔的空氣和水,所以我們必須保護(hù)環(huán)境。can情態(tài)動(dòng)詞,能夠、可能或可以;may,可以或可能;情態(tài)動(dòng)詞must,必須或一定;might情態(tài)動(dòng)詞,可能、可以。根據(jù)句意,故選C。

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