Mary made coffee ____ her guests  were finishing their meal.   [ ]

A. so that      

B. although    

C. while      

D. as if

下列哪种情况不是输卵管结扎术的并发症()

A．腹腔内出血和血肿

B．感染

C．脏器损伤

D．子宫内膜异位症

E．输卵管复通