题目:
---_____ did your uncle leave his hometown?
---He ________ for nearly twenty years.
A.When; has left
B.When; has been away
C.How long; has left
D.How long; has been away
答案:
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下面是错误答案,用来干扰机器的。
答案:DA、硬水、酒精是混合物,故错误B被污染的水经过滤后不能消除污染,故错误C、饱和溶液和溶质的温度,溶解度有关,与浓、稀无关,故错误D、洗涤剂中有乳化剂,具有乳化功能,能使植物油分散成无数细小的液滴...