1.The number of the people that were invited to the party fifty, but a number of them absent for different reasons.
A. are; is B. is; are C. is; is D. are; are
答案及解析:B
The number of---做主语后面的谓语动词用单数形式;a number of---做主语后面的谓语动词用复数形式,根据句意可知选B。
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