I hate when someone makes a mess of my learning materials on my desk.
A. it
B. that
C. this
D. one
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(答案→)A. it
B. that
C. this
D. one
解析:“it”作形式主语,常常与某些动词连用构成固定句式;“it”指代后面句子所陈述的事情。例如:hate/dislike it when...;appreciate/help it if...等等。句意:我就讨厌有人把我桌子上的学习材料弄得乱七八糟的。