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【单选题】
暴露于牙龈缘以上的牙体称:A.
牙颈
B.
解剖冠
C.
临床冠
D.
牙根
E.
颈部
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反馈参考答案：
举一反三
【简答题】How long has this been going on?
【简答题】石膏的分子式是 ;芒硝的分子式是 。
【单选题】How long has this study been ongoing at the point of this speech?
A.
75 years
B.
58 years
C.
65 years
D.
47 years
【单选题】听力原文：M: Now, then, Mrs. Darcy. How long has this tooth been giving you trouble? W: Well, I had it filled last year and was all right until last Sunday. Then it started hurting again. Q: How long has t...
A.
For a few days.
B.
For several weeks.
C.
Since last year.
D.
For a few hours.
【单选题】— How long has this bookshop been in business?
A.
____ 1982.
B.
After
C.
In
D.
From
E.
Since
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