He was heard _____(sing) at 9 p.m.yesterday.

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Hewasheard_____(sing)at9p.m.yesterday.Hewasheard_____(sing)at9p.m.yesterday.Hewasheard_____(sing)at9

He was heard _____(sing) at 9 p.m.yesterday.
He was heard _____(sing) at 9 p.m.yesterday.

He was heard _____(sing) at 9 p.m.yesterday.
singing 过去现在时态很明显!

song