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一道英语单选题~请解释一下~

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一道英语单选题~请解释一下~
-Why does Mary look so happy?
-She,as well as her two classmates____ to attend this year's summer camp.
A has been invited
B was invited
解释一下呗~
一道英语单选题~请解释一下~
选a
主语虽然有She和her two classmates 但as well as 出现 ,以它前面的主语为句子主语
Mary look so happy 她很高兴,说明是一种完成对现在的影响 是结果