问题
选择题
The government has taken measures air quality. [ ]
A. to improve
B. improved
C. being improved
D. to be improved
答案
A
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The government has taken measures air quality. [ ]
A. to improve
B. improved
C. being improved
D. to be improved
A
龋坏穿髓，
颊侧牙龈肿胀，叩痛（++），
已完全萌出，沟裂深，颈缘及面软垢较多