1.After ten hours' operation,the doctors managed to ____the one-year-old twin at the head.
A.isolate B.separate C.divide Dremove
为什么选C不选B
2.--where is jack?
----well,he____you___here,or else he would be here right now
A.doesn't know,are B.hadn't known,were C.didn't know,were D.hasn't known,were
为什么选A不选C
3.all of them felt necessary that they___the meeting.
A.attend B.were to attend C.attened D.would have attended
为什么选A不选C