He ____(think)hard and then had an idea.

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He ____(think)hard and then had an idea.

He ____(think)hard and then had an idea.
He ____(think)hard and then had an idea.

He ____(think)hard and then had an idea.
thought

thought
后面是had 所以用过去式
祝你学习进步

He thought hard and then had an idea.

thought

thought
在这个句子中,and连接的两个谓语动词是平行关系,时态也就应该是一致的。