______she swim when she was nine years old?A.Can B.Could C.Can’t D.If为什么不能选A?

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______she swim when she was nine years old?
A.Can B.Could C.Can’t D.If
为什么不能选A?

B
从was看出句子为过去式,所以情态动词也应该用过去式,Could是Can 的过去式.
她九岁时会游泳吗?

句意：当她九岁时会游泳吗？
这说的是过去的情况，要用can的过去式could才行。

选择B，讲述的是她九岁的事。为过去式。

B, 句子时态要统一，when引导的时间壮语从句中的was表明是过去时，主句也应该是过去时。

因为从句中用的是she was 一般过去时，问的是在她9岁的时候，她会游泳吗？所以应该选can 的过去时could.

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