问题

Our government has to do something ________ our environment.
A:protect
B:protected
C:protecting
D:to protect;
B:protected
C:protecting
D:to protect;
正确答案是:
同类题型
7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.
I know a little bit about the city as I __________ there for one year in my youth.
Can you tell me how long the bookstore has ________
Our teacher asks us to the notes in class.
Have you heard of Liu Qian from Taiwan –Sure! His magic performance is amazing for people forget.