问题
选择题
We should collect some rubbish _____ the environment.[ ]
A. help to protect
B. to help protect
C. to help protecting
D. helping protect
答案
B
搜题请搜索小程序“爱下问搜题”
We should collect some rubbish _____ the environment.[ ]
A. help to protect
B. to help protect
C. to help protecting
D. helping protect
B