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(shí)態(tài)。根據(jù)句中時(shí)間狀語(yǔ)over the past few months在過(guò)去的幾個(gè)月，故用現(xiàn)在完成時(shí)態(tài)。所以選擇C項(xiàng)。
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