选B,主句是The reason is that
why he failed是对the reason 的修饰
The reason why he failed is ____ he was too careless.
The reason why he failed is ____ he was too careless.
A.because B.that C.for D.because of
有异议啊
A.because B.that C.for D.because of
有异议啊
英语人气：127 ℃时间：2020-05-30 16:23:19
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