The smog arrived in the Yangtze River De
题型:选择题
问题:
The smog arrived in the Yangtze River Delta region on Nov.30,_________the air quality in 1 2 cities out of 25 was rated as severely polluted by Dec.1.
A.where
B.when
C.which
D.what
The smog arrived in the Yangtze River Delta region on Nov.30,_________the air quality in 1 2 cities out of 25 was rated as severely polluted by Dec.1.
A.where
B.when
C.which
D.what