时态的单选一道
问题描述：
时态的单选一道
1.Man ____ profit, unaware of the harm he has done to the environment.
a is always pursuing
b was always persuing
c had always pursued
d had always been pursuing
选什么?为什么?
答
A,人类一直在追求利润,并未意识到对环境造成了巨大的危害