题目内容

.How dirty the tables are! They need___.
to clean                B. clean
C.cleaning                  D. Cleaned
C
本题考察被动语态，从被动语态的结构来看本题没有选项，但英语中有种用法—为主动表被动。need doing=" need" to be done,因此可以排除A,B,D,正确答案为C.
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