Nobody knew that the reason______ he was often blamed. Perhaps that was______ he made the same mistakes told several times.

A．which; because

B．why; because

C．that; that

D．why; that

暂时性错的临床表现是（）

A.后牙反

B.个别前牙反

C.Ⅲ度深覆、Ⅲ度深覆盖

D.Ⅲ度牙列拥挤

E.上颌侧切牙萌出时，牙冠向远中倾斜