We need to discuss the plan____before singingA.carefulB.with detailC.in detailD.careless

We need to discuss the plan____before singing
A.careful
B.with detail
C.in detail
D.careless

选C
A错误,修饰动词不能用形容词,应该用副词carefully
B错误,固定搭配,in detail
D错误,原因同A