if everyone makes a contribution __ the environment.our country w_英语解答

if everyone makes a contribution __ the environment.
our country will become more beautiful
a: to protect
b: to protecting
答案和具体原因

人气：143 ℃　时间：2019-11-19 09:15:20

解答

答案:B.to protectin
make a contribution to sth/doing sth.对.作贡献.
这是固定的句型,注意那个"to"是介词而不是不定式,介词后面要加动词或动名词.