Question

he must attend the meeting tonight

1.He must have attended the meeting yesterday,___ he?
A.didn't B.mustn't C.needn't D.hasn't
2.Do you consider it any good___the truck again?
A.to repair B.repairing C.repaired D.being repairing
3.I couldn't have got to the meeting on time ____ an earlier train.
A.if I had not caught B.unless I had caught
C.if I did not catch D.unless I caught
答案分别为A,B,A 请讲解,

Answer 1

刚刚才看到你发给我的消息,以后的话发到百度hi里,不要发空间里了.
1,must当必须的时候才用mustn‘t反义疑问,这里must是must have done,表示推测的,实际的动作还是attend,所以用didn't
2,你说答案是A是吧,A没有B合适,repairing the truck表示修车这件事,要是用不定式表示还没做的事情.
3,是if引导的虚拟语气,与过去事实不符,从句用if +had down,主句用could/should/would/might have done
有什么疑问还可以问我,我一直在线.