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【单选题】
When did I tell the dentist he had pulled out the wrong tooth in the end?A． After tA.
25． When did I tell the dentist he had pulled out the wrong tooth in the end? A． After the tooth was pulled out of my mouth．
B.
After the cotton-wool was pulled out of my mouth．
C.
When the dentist was asking me questions．
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】G-C 含量愈高 Tm 值愈高的原因是 :
A.
G-C 之间形成了离子键
B.
G-C 之间形成了两个氢键
C.
G-C 之间形成了三个氢键
D.
G-C 之间形成了一个共价键
【简答题】礼的三层含义包括()、规范、尊重别人。