题目:
— What's the matter with Jane? She has been sitting there for hours.
— A letter from her mother _____ an attack of homesickness in her.
A. set out
B. set off
C. sent off
D. sent up
答案:
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参考答案:A解析:如果采用单端固定桥修复,必须尽量减小桥体的咬合负担,以避免基牙负担过重。当缺牙间隙窄、前牙浅覆或前牙开时,固定桥修复后,桥体和基牙的受力小。有邻面浅龋者,可先充填或在基牙预备时将腐...