Are you ready a game?[ ]
A. to
B. at
C. for
答案：C
牙列缺失后，颔骨的改变最主要表现为 （）
A.颌骨的吸收
B.颌骨的增生
C.颌骨的移位
D.牙槽骨的吸收
E.牙槽骨的增生
（2014年北京市西城区高三5月二模试题）24. Grandpa was shocked by the news. Rarely ______ him so quiet.
A．do I see
B．had I seen
C．I had seen
D．I saw
