医疗废物的定义及分类:英语问题

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If the south had won the war,______ is now the United States might have been divided into several countries. A.what B.where C.there D.that
菁菁: 2.Air is to us____ water is to fish. A.that B.what C.where D.how
解答啦,谢谢,追加分
能告诉我为什么吗》

1d
2b
第2个举行是固定搭配,这个我敢肯定

D.that
B.what

1 D 2B

1 D 条件状语 指代前面的 IF xxxxx
2 D 理由同上