题目内容：

kate ___swim when she was six years old.she was so clever.
a:be able to b:is able to c:was able to d:was ble

优质解答

C was able to
be able to do sth.能,会
用一般过去时 was able to
翻译：当她6岁时就会游泳.她如此的聪明.
不明白的再问哟,请及时采纳,多谢!