It’s not good idea to drive for four hours without break. A. a; aB. the; aC. the; theD.

问题补充：

It’s not good idea to drive for four hours without break.

A. a; a

B. the; a

C. the; the

D. a; the

答案：

A. a; a

B. the; a

C. the; the

D. a; the

解析：开车好几个小时没有一个一次休息不是一个好主意，所以从意义上都是单数，而且是可数名词，所以都用不定冠词a.