该患者初步考虑可能为

A．食管癌

B．食管静脉曲张

C．食管炎

D．食管中段牵引型憩室

E．贲门失弛缓症

The environment in our town is getting worse and worse, so many trees _______. [ ]

A. are planting

B. should be planted

C. should plant

D. will plant