I think it is necessary for my 19-year-old son to have his own mobile phone, for I

sometimes want to make sure if he ＿＿ home for dinner. [ ]

A. come        

B. comes      

C. has come        

D. will come

哪些情况可以发生羊水栓塞：

A．早孕大月份钳刮术

B．羊膜腔穿刺

C．剖宫产

D．人工流产

E．药物流产