Your father is quite a good swimmer.--Sure he is.He ofen-------when he was young.a.swims b.swam c.swum 说明理由

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Your father is quite a good swimmer.--Sure he is.He ofen-------when he was young.a.swims b.swam c.swum 说明理由

Your father is quite a good swimmer.--Sure he is.He ofen-------when he was young.a.swims b.swam c.swum 说明理由
Your father is quite a good swimmer.--Sure he is.He ofen-------when he was young.
a.swims b.swam c.swum 说明理由

Your father is quite a good swimmer.--Sure he is.He ofen-------when he was young.a.swims b.swam c.swum 说明理由
b.swam
when he was young是一个一般过去时态
swims 是现在时
swum 是过去分词

B
when h was young说明句子要用过去时态
所以swim用过去式

b.swam
swim
的一般过去式,时态根据后边从句可知when he was...

指过去,应选b

A
看到often基本上可以确定是一般现在时,用第三人称单数

A,ofen表示一般时态

你的爸爸是一个安静的游泳员,--是的,他是。-----当他过去。