When ______ why he was late,he said he had missed the first bus.A.asking B.asked C.to be asked D.to ask我选的是D,为什么呢?

When ______ why he was late,he said he had missed the first bus.A.asking B.asked C.to be asked D.to ask我选的是D,为什么呢?
When ______ why he was late,he said he had missed the first bus.
A.asking B.asked C.to be asked D.to ask
我选的是D,为什么呢?

When ______ why he was late,he said he had missed the first bus.A.asking B.asked C.to be asked D.to ask我选的是D,为什么呢?
因为这里省略了一部分成分；即：when he was asked,这不就是被动形式了吗,不需要你说的不定式,

"当他被问为什么迟到"是个被动句 被动句不能用不定式 再有是在过去问的 所以用过去时