题目内容
— There is a lot of wind in North China.
— Well, more trees ________ every year to stop the wind.
A. must be planted B. can plant
C. should planted D. must been planted
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题目内容
— There is a lot of wind in North China.
— Well, more trees ________ every year to stop the wind.
A. must be planted B. can plant
C. should planted D. must been planted