成人高等教育 / 大学英语（下）
正确率：100%
— It's very windy and dusty in Beijing .
—Well, more trees _ _ _ _ _ _ every year to stop the wind and sand.
- A、
should plant
- B、
should planted
- C、
can planted
- D、
must be planted
参考答案：
佳题速递：