In the past few months, a discussion ________about whether selecting “Three Goods” Students in elementary and middle schools should be cancelled.
A.has to be held
B.has been held
C.has been holding
D.was held
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B解析这题考查时态语态，时间是：In the past few months,所以用现在完成时，而且讨论是被进行，所以用现在完成时的被动式。选B。