We saw a big snake in the grass yesterday which all of us to death.A. frightened; frigh

问题补充：

We saw a big snake in the grass yesterday, which all of us to death.

A. frightened; frightened C. frightened; frightening

C. frightening; frightened D. frightening; frightening

答案：

解析：考查形容词用法。本题第一空用现在分词frightening转换而来的形容词修饰名词snake，第二空中的frightened是句子的谓语动词，根据上文的saw说明使用一般过去时。过去分词转换的形容词常常用来修饰人或者与人有关的事物如look, appearance；现在分词转换的形容词常常用来修饰事物。这样的形容词经常在句中做表语或者定语修饰名词，也可以在句中构成形容词短语对主句的情况进行说明。故C正确。