Buying clothesa hard job because the clothes a person likesnot very often fit him or her.

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A. are: d0
B. is; does
C. are; does
(答案→)D. is; do
解析：考查主谓一致。本题第一空要使用单数形式，因为主语是动名词短语buying clothes；第二空主语是the clothes，名词clothes在句中做主语的时候，谓语动词使用复习形式。句意：买衣服是一件很困难的工作，因为一个人喜欢的一份不一定就适合他。故D正确。