---Is it Pro. King that will give the lecture on radiation?--- I can't __ I know it for sureA.sayB.tellC.speakD.talk
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A解析考一组动词同义词的区别。意思是“我不敢说我对此事十分清楚。”say后要跟所说的内容。tell的固定用法为tell sb about sth，tell a story，tell a lie，tell the truth；而speak则是speak to sb, speak at a meeting, speak English; talk的通常用法为talk to/with sb；talk about sth。