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【简答题】
拔除过程中可使用旋转力的牙齿是（ ）。
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举一反三
【单选题】Something else I’ve greatly enjoyed is working as _____ peer mediator, someone who helps _____ students to settle problems that they have with other students.
A.
the; the
B.
/; /
C.
a; the
D.
a ; /
【单选题】Someone who stays with you and helps you in times of trouble ，rather than turning his _____ ，is a true friend .
A.
face
B.
head
C.
hand
D.
back
【简答题】someone who helps people to improve at a sport, skill or school subject
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