问题
选择题
Every year millions of trees _____ to prevent floods, droughts and sandstorms. [ ]
A. plant
B. are planted
C. are planting
D. were planted
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Every year millions of trees _____ to prevent floods, droughts and sandstorms. [ ]
A. plant
B. are planted
C. are planting
D. were planted
答案：B