Peter must be ill. It’s the only thing that can  _________ his strange behavior.

A．lie in

B．result from

C．account for

D．explain about

女性，56岁。患胆囊结石3年。平时无症状。B超检查示胆囊壁厚0．4cm，结石周围未见胆囊腔，胆囊肿胀，内回声不均匀，胆囊13cm×4cm，结石>2．0cm，胆总管1．1cm。下一步应选择（）A.开腹手术胆囊切除

B.腹腔镜胆囊切除

C.腹腔镜胆囊切除，切除困难时中转开腹

D.做ERCP或MRCP

E.保守治疗