The idea ▁▁▁ they came up with was very good. A. then B. it C./ D.what

问题描述:

The idea ▁▁▁ they came up with was very good. A. then B. it C./ D.what

答案:C
这里that引导定语从句修饰前面的idea,that在定语从句中作宾语,可以省略,所以正确答案是C.