问题补充：
-The desks are very dirty.
-Let meyouthem.
A. to help;clean
B. help;clean
C. helps;to clean
D. to help;to clean
答案：
A. to help;clean
(答案→)B. help;clean
C. helps;to clean
D. to help;to clean
解析：让某人做某事可以说let sb do sth，help sb（to）表示帮助某人做某事，故本题选B。
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