It was getting __________, he had to stop to have a rest.

It was getting __________, he had to stop to have a rest.
A、very darker
B、dark and dark
C、darker and darker
D、darkest and darkest
【正确答案】：C
【题目解析】：比较级 + 比较级 ：越来越……；固定搭配It was getting darker and darker  天变得越来越黑了。