问题补充：
单选题WatchingtheonlineopencoursesofsomefamousEuropeanandAmericanuniversities_______anewfashionamongwhitecollarsinChinaoverthepastfewmonths.A.becameB.had becomeC.has becomeD.becomes
答案：
C解析本题考查时态。根据句中时间状语over the past few months在过去的几个月，故用现在完成时态。所以选择C项。
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