A car broke down and that was ____ caused the traffic jam.A.how B.why C.which D.what为什么选D,不选B
问题描述：
A car broke down and that was ____ caused the traffic jam.
A.how B.why C.which D.what
为什么选D,不选B
答
本句如用why，则why前面还要加"reason'
你只所以选why，是你用汉语思维代替了英语思维，这里母语起到了强烈的干扰作用
答
that was 后面要加的是表语部分，在这里是用一个人名来作表语，但是这个表语中缺少主语，所以要用what来既作表语又作主语，别的词都没有这种双重功能。
答
当初学英语没记什么语法，只是朗读背诵~~~
A car broke down and that was why the traffic jam happened.
比较一下吧
答
why+主+谓
why it caused the traffic jam.
答
was缺少表语,而 caused 缺少主语,在下面4个选项中,只有what 可以作为两种成分,what 也可译为 that that ,第一个that 为was的表语,第二个that为caused 的主语