Malaysia Airlines Flight 370 ___________ course and turned back toward Kuala Lumpur -- but there were no indications from the pilot that he was doing so.

A．must have changed

B．could have changed

C．might have changed

D．should have changed.

下列不适合选择腹腔镜检查的情况是（）

A.异位妊娠

B.不孕症

C.过度肥胖

D.子宫内膜异位症

E.寻找腹腔内异物