christmas day is coming.each of them...buys ...for christmsa
问题描述：
christmas day is coming.each of them...buys ...for christmsa
A.are;preparing B is; preparing C.are;prepare D.are; prepare
答
选 B
因为主语是each 是单数,谓语动词用单数第三人称.根据语法结构,is后面接动名词
christmas day is coming.each of them is preparing for christmsa