Watching the online open courses of some famous European and American universities _______a new fashion among white collars in China over the past few months.
A．becameB．had becomeC．has becomeD．becomes
C
本題考查時態(tài)。根據(jù)句中時間狀語over the past few months在過去的幾個月，故用現(xiàn)在完成時態(tài)。所以選擇C項。
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