有图题
参考答案：A
解析：
含牙囊肿最多见于（）
A.下颌第一磨牙
B.下颌第二磨牙
C.下颌第三磨牙
D.下颌前磨牙
E.上颌第三磨牙
_____ troubles me is _____ I don't know _____ is to be done with the new machine. [ ]
A. What; what; that
B. What; that; how
C. What; that; what
D. What; because; which
