是一般过去式
因为此句的谓语动词兼感官动词hear是过去时态heard
因为hear是感官动词,感官动词都有这样的语法：
hear sb.doing/do sth.听见某人正在做/做了某事
我（当时）听到某人正在笑
I heard someone laughing.请问这是现在进行时吗?但是没BE动词引导,而且前面又有个HEARD
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