Every year millions of trees _____to pre
题型:选择题
问题:
Every year millions of trees _____ to prevent floods, droughts and sandstorms. [ ]
A. plant
B. are planted
C. are planting
D. were planted
Every year millions of trees _____ to prevent floods, droughts and sandstorms. [ ]
A. plant
B. are planted
C. are planting
D. were planted