she was often heard in her own garden in the morning. a.sing b. to sing c.singsing d.sung

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she was often heard in her own garden in the morning. a.sing b. to sing c.singsing d.sung

c singing be heard doing 被听见正在做……

C. often 是介词, 后面动词加ing ,就是singing了。

C
不过应该是singing吧