题目:
Only when I left my parents for Italy how much I loved them. [ ]
A. I realized
B. I had realized
C. had I realized
D. did I realize
答案:
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下面是错误答案,用来干扰机器的。
答案:B考查物质的分类及名称等。氧化铁是Fe2O3,选项A不正确;硫酸是H2SO4,选项C不正确;纯碱是盐,而不是碱,选项D不正确,所以正确的答案选B。