People in China don’t often kiss or hug each other goodbyes or hellos, which ______ a mon _______ in some European countries.A.are; practiceB.is; exerciseC.are; exerciseD.is; practice
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D解析这题考查第一空，考查主谓一致，这里which指前面的句子，当单数用，第二空考查词组：a mon practice“惯例”。选D。