I have heard both teathers and students ---well of him A to speak Bspoken Cto have speak D speak

问题描述:

I have heard both teathers and students ---well of him A to speak Bspoken Cto have speak D speak
为什么选D、、、

这里动词不定式作感官动词hear的宾语被足语,这个时候的动词不定式要省略to,其他的感官动词还包括see,find等.