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

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shewasoftenheardinherowngardeninthemorning.a.singb.tosingc.singsingd.sungshewasoftenheardinherowngar

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

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