He______ to sing English songs when he was only six years oldA.canB.was able toC.is able toD.able to

分类: 作业答案 • 2022-04-12 23:49:21

问题描述：

He______ to sing English songs when he was only six years old
A.can
B.was able to
C.is able to
D.able to

答

B 过去式