因为B选项表示的是“problem”而AC不是吧.
_____is a big problem.
1个回答
相关问题
-
Population is a big s___ problem.
-
Sewage______(treat)is a big problem in many big cities.
-
Man is now facing a big problem ______ which is becoming mor
-
population is _____ big problem for eities .
-
pollution isn't a big problem now,is it 怎么翻译
-
Nowadays food safety is a big problem and nobody can guarant
-
完形填空garbage is a big problem.we throw away
-
What Mr. King said is a big problem _____ at the next m
-
Pollution isn't a big problem now,is it?( ) Pollution isn't
-
英语首字母填空There are some big problems in big cities.It is e____