为避免损伤牙龈组织，上颌前牙区舌侧基托边缘应远离龈缘（）。
A.1～2mm
B.2～3mm
C.3～4mm
D.4～6mm
E.6～8mm
参考答案：D
______ was most important to her, she told me, was her family.
A．It
B．This
C．What
D．As
