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.became | B.had become | C.has become | D.becomes |
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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.became | B.had become | C.has become | D.becomes |