It's our duty ________ the classroom________.

A. keep; clean　　  B. to keep; clean　　 C. to keep; cleaner  D. keep; cleaner

 

答案：B
提示：

第一空用不定式，它是真實(shí)主語(yǔ)，另外keep后面加形容詞，系表結(jié)構(gòu)。

 


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