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BothMaryandEllen,aswellasJan,studyingChineseHistoryA.areB.isC.arebeingD.isbeing选哪一个?为什么?

题目详情
Both Mary and Ellen,as well as Jan,_______ studying Chinese History
A.are B.is C.are being D.is being
选哪一个?为什么?
▼优质解答
答案和解析
A as well as前面的是主语 both Mary and Ellen用复数