A car broke down and that was ---- caused the traffic jam.

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

1个回答分类：英语 2014-11-16

问题解答：

我来补答

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

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