肩关节外展动作小心翼翼，并有突然疼痛者，可能为（）

A.肩关节脱位

B.锁骨骨折

C.肱二头肌损伤

D.冈上肌肌腱炎

E.三角肌下滑囊炎

I called ________ his house this morning, but he wasn’t in. So I left a message telling him I would call______ him the next day.

A．on; on

B．at; at

C．at; on

D．on; at