问题
选择题
The doctor tried his best _____ the boy's life.[ ]
A. saving
B. to save
C. save
D. saved
答案
B
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The doctor tried his best _____ the boy's life.[ ]
A. saving
B. to save
C. save
D. saved
B
，磨牙完全Ⅱ类颌关系，前牙深覆Ⅲ°，深覆盖Ⅱ°上牙列拥挤Ⅰ°，
缺失，上前牙唇倾上颌轻度前突，下颌位置基本正常，牙周情况良好。
系