Hardly had all the points that the teacher taught        down when the bell rang．

A．to aken

B．taking

C．taken

D．been taken

利凡诺引产术适用于（）

A.妊娠49天以前

B.妊娠10周内

C.妊娠10～14周

D.妊娠15～24周

E.妊娠14～28周