He wrote a letter ______ he explained what had happened in the accident.A.what B.which C.where D.how 选哪个,重要的是为什么.

He wrote a letter ______ he explained what had happened in the accident.A.what B.which C.where D.how 选哪个,重要的是为什么.
He wrote a letter ______ he explained what had happened in the accident.A.what B.which C.where D.how 选哪个,重要的是为什么.

He wrote a letter ______ he explained what had happened in the accident.A.what B.which C.where D.how 选哪个,重要的是为什么.
He wrote a letter ___C___ he explained what had happened in the accident.
A.what B.which C.where D.how
因为从句中不缺名词成分,所以不是which
而根据句意来看是,应该是
He wrote a letter on which he explained what had happened in the accident.
on which=where