1.The Whites were very poor at that time and ___ send their children to school.
问题描述：
1.The Whites were very poor at that time and ___ send their children to school.
A.are not able to B.could not be able to
C.cannot D.could not
2.The train ___when they ___ to the railway station.
A.left,had got B.left,got
C.had left,had got D.had left,got
答
1.第一题：C.本题考察be able to 和can 的区别.二者都有“能、会”的意思.在一般现在时和一般过去时中二者可以互换.但前者还可用于将来时和完成时中.本题从were来判断,应该用一般过去时.所以排除A、C.二者不能同时连...