问题
选择题
—What can we do to improve the environment of Beijing?
—More and more trees _______, I think. [ ]
A. must be planted
B. must planted
C. must be plant
D. must plant
答案
答案：A
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—What can we do to improve the environment of Beijing?
—More and more trees _______, I think. [ ]
A. must be planted
B. must planted
C. must be plant
D. must plant
答案：A