When he was four years old,he___sing several English songs?A.could B.can C.may
问题描述：
When he was four years old,he___sing several English songs?A.could B.can C.may
答
He was able to speak english when he was four years old. was able to He was able to speak English when was able to is
答
A 过去式 前后时态一致！
答
A吧
过去式
答
A 主句与从句要时态一致
答
A 表示他在四岁时能够唱英语歌 并且使用过去式
答
答案为B。表示一般的情况，事实，用一般现在时就可以。表能力。