Look what a dirty classroom we have got! It really wants .A. cleanB. cleanedC. cleaningD.

问题补充：

Look, what a dirty classroom we have got! It really wants .

A. clean

B. cleaned

C. cleaning

D. to clean

答案：

A. clean

B. cleaned

(答案→)C. cleaning

D. to clean

解析：考查动名词做宾语：want doing=want to be done需要被做，句意：看，我们的教室多脏啊，真需要打扫了。选C。