If everyone makes a contribution_____the environment,our country will become more beautiful.A.to protect B.in protectingC.protecting C.for protecting请说明理由！
问题描述：
If everyone makes a contribution_____the environment,our country will become more beautiful.
A.to protect B.in protecting
C.protecting C.for protecting
请说明理由！
答
A
查下字典就清楚啦~固定搭配