问题
选择题
I _____ e-mails to my pen pal when Susan called me last night. [ ]
A. was sending
B. am sending
C. sent
D. was sent
答案
答案：A
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I _____ e-mails to my pen pal when Susan called me last night. [ ]
A. was sending
B. am sending
C. sent
D. was sent
答案：A
缺失，余留牙正常，口底至舌侧龈缘的距离为10mm。设计铸造支架义齿，
采用RPI卡环组。