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17. To cut down on the garbage, it is essential that all household trash _____ and put into trash bags.
(A) must be classified
(B) be classified
(C) is classified
(D) should classify


答案:B
難度: 困難
1F
我愛阿摩,阿摩愛我 (2012/05/02)
it is essential that + S +(should) +V原形

17. To cut down on the garbage, it is es..-阿摩線上測驗