【題目】It's our duty our environment clean.
A.keep
B.to keep
C.keeping
D.for keeping

【答案】B
【解析】句意：保持環(huán)境干凈是我們的責(zé)任。句型：It's one's duty to do sth。做某事是某人的責(zé)任。it作形式主語，指代后面的不定式。故選B。

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