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【单选题】
牙髓摘除术的适应证是A.
各型牙髓炎
B.
急性根尖周炎
C.
慢性根尖周炎
D.
牙髓坏死
E.
牙髓坏疽
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反馈参考答案：
举一反三
【单选题】Sara kept the secret to ________ and nobody knew about it.
A.
hers
B.
her
C.
herself
D.
she
【单选题】Nobody knew who was the first ________ at school that morning when the window was broken.
A.
arriving
B.
arrived
C.
to arrive
D.
have arrived
【单选题】综合布线系统双绞线电缆中常用的 4 对电缆有四种本色,它们是( )。
A.
蓝色、橙色、绿色和紫色
B.
蓝色、橙色、绿色和棕色
C.
蓝色、红色、绿色和棕色
D.
白色、橙色、绿色和棕色
【单选题】_____ seemed as if nobody knew anything about the matter.
A.
This
B.
That
C.
It
D.
One
【单选题】Nobody knew how he came up with this ______ idea about the trip.
A.
weary
B.
twilight
C.
unanimous
D.
weird
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