I suppose they have known about it,_____

I suppose they have known about it,_____ I suppose they have known about it ,( I suppose nobody knows about it,_____?a.do i b.do they c.dos They _____ about it,I'm sure they didn't know.A.must have kn They kept trying _____ they must have known it was hopeless. 22.They kept trying _____ they must have known it was hopele It s____ that they have known it I have known nothing about everything是什么意思? had i known it ,i would have.. I suppose nobody knows about it的反义疑问句是什么? —— ______ you suppose it _____ going to rain?—— I suppose so 1.＿＿＿have already known about it.