I feel sorry for myself .If I   more efforts to my studies , I wouldn’t be doing a job with such low wages.

A devoted     B had devoted   C should devote   D were to devote

腮腺导管口的正确位置位子

A．在平对上颌第一磨牙牙冠的颊黏膜上
B．以上都不对
C．在平对下颌第二磨牙牙冠的颊黏膜上
D．在乎对上颌第二双尖牙牙冠的颊黏膜上
E．在乎对上颌第二磨牙牙冠的颊黏膜上