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1.i am busy now,so i can't help____the machine

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1.i am busy now,so i can't help____the machine
a.to repair b.to have repaired
c.repairing d.fixing
2.we agreed____here but so far she hasn't turned up yet
a.having met b.meeting c.to meet d.to have meet
3.go on___the other exercise after you have finished this one.
a.to do b.doing c.with d.to be doing
4.mike,you must get your study room ___after lunch.
a.being cleaned b.to clean c.cleaning d.cleaned
都要告诉我原因的
A 这里不是一般所认为的 can not help doing (情不自禁做某事)固定词组,而是帮助某人做某事 help to do
C agree to do 同意做某事
A go on doing 意思是继续做这件事(手头上正在做的这件事) 而 go on to do 意思是这件事做好后继续开始做另一件事
D get sth.done 某件事被做,房间被你整理好