Airpollutionisgettingmoreandmoreserious,sowemusttakeact...
问题详情:
Air pollution is getting more and more serious,so we must take action________it is too late.
A.before B.after
C.until D.when
【回答】
A
知识点:连词
题型:选择题
问题详情:
Air pollution is getting more and more serious,so we must take action________it is too late.
A.before B.after
C.until D.when
【回答】
A
知识点:连词
题型:选择题