Many students _________________ (say) they learnt English by using it.

问题描述:

Many students _________________ (say) they learnt English by using it.

因为后半句的动词“learnt”是learn的过去式,前后时态要一致,所以用said

应填said 宾语从句 后有learnt为过去时 所以为过去所说为过去时.