I think ____ the poor children is our duty

问题描述:

I think ____ the poor children is our duty
A.helping B.help C.helps D.helped
选什么啊,最好讲明原因

A原因是这里用动名词作了主语,首先可以用排除法做:如果选择B.C.D.那么一个句子中将有两个谓语动词,而缺少主语.因此不选.其次可以从正面考虑,这句话是一句倒装句原句是our duty is helping the poor children因此所...