问题描述：
一道英语题（有答案要讲解）
In order to protect our planet,_________
A.all kingds of pollution should be reduced
B.we should reduce all kingds of pollution
C.the environment should be protect first
D.it's important to protect our environment
答案是B为什么不能用A
In order to protect our planet,_________
A.all kingds of pollution should be reduced
B.we should reduce all kingds of pollution
C.the environment should be protect first
D.it's important to protect our environment
答案是B为什么不能用A
问题解答：
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