A number of experts ________ invited, but the number of the experts who attended the conference ________ only 20．
A.were; wasB.was; wereC.was; wasD.were; were在线课程A
解析：
a number of+名词复数，“许多”，谓语动词用复数；the number of…的数量，谓语动词用单数．
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