Look!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eat C.areLook!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eatC.are;eating D.are;to eat选什么 解释一下

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Look!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eat C.areLook!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eatC.are;eating D.are;to eat选什么 解释一下
Look!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eat C.are
Look!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eat
C.are;eating D.are;to eat
选什么 解释一下

Look!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eat C.areLook!There ____a number of sheep ___grass in the fields. A.is;eating B.is;to eatC.are;eating D.are;to eat选什么 解释一下
答案C
首先要知道there be句型有个就近原则(即靠be动词最近的名词决定be的形式)
a number of 是许多的意思,要和the number of...的数量区别开来 ;如果是a number of 谓语动词用复数形式,the number of 谓语动词用单数.所以第一个空填are
look是现在进行时的时间标志,看,有许多羊正在吃草,所以第二个空用v-ing(eating).