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but,___the archaeologists have been unalbe

but,___the archaeologists have been unalbe

3 for a long time --------很久以来,直到现今。----------用现在完成时 如果李宽是until now, 就应该是until now they haven't been able - - -- -------- not - -- until not 要搭配 untilyouyouniao84 09:07:23这就不知道了palmaking 09:07:31for a long time 搭配unable youyouniao84 09:07:47答案错了?palmaking 09:07:52unable不如扰芹是渣毕否定词youyouniao84 09:08:07哦palmaking 09:08:26至少,我是这样感觉的youyouniao84 09:09:02