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请问为何选BIt's been 3 weeks and both of them -------.A.still don

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请问为何选B
It's been 3 weeks and both of them -------.
A.still don't talk B.are not still talking
因为前面是It's been 3 weeks,意思是说持续了三周了,他们都没有说话,有一个持续的意思哈,所以要用进行时,他们持续了三周仍然没有说话