He sits down and had a test,还是把sits的s去掉?

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He sits down and had a test,还是把sits的s去掉?

你and后用的是had 也就是过去式
那么 sit就应该也用过去式sat

sat

因为后面有个had,所以是过去式,所以要用sit的过分式sit

sat down

应该是He sat down and took the test.