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Two of the boys in our class____always______when the teacher

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Two of the boys in our class____always______when the teacher is speaking
A.are;talking
B.is;talking
C./;talk
D./;talks
Two of the boys in our class____always______when the teacher
are talking
再问: 为什么?
再答: 语意上讲得通呀 老师在讲课的时候,我班总有两个男生在讲小话 进行时态要用 am(is, are)+ v-ing 由于主语是Two of the boys 复数, 所以排除B(单数谓语)