上半口义齿基托后部的封闭区是（）
A.上颌结节颊侧
B.颧突区
C.腭小凹
D.上颌后堤区
E.上颌硬区
参考答案：D
While you were in London that year,the London Bridge______.
A．was being repaired
B．had been repaired
C．would be repaired
D．was repaired
What day _____ it the day before yesterday? [ ]
A. am
B. is
C. were
D. was
