问题详情:
– The air pollution is terrible.
– It will be worse we take action to protect the environment.
A. until B. if C. unless D. when
【回答】
C
知识点:连词
题型:选择题
问题详情:
– The air pollution is terrible.
– It will be worse we take action to protect the environment.
A. until B. if C. unless D. when
【回答】
C
知识点:连词
题型:选择题