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but,thearchaeologistshavebeenunalbe1beforehand2untilnow3foralongtime4atthisdistance选择哪一个,为什么

题目详情
but,___the archaeologists have been unalbe
1 beforehand 2 until now 3 for a long time 4 at this distance
选择哪一个,为什么
▼优质解答
答案和解析
3
for a long time --------很久以来,直到现今.----------用现在完成时
如果是until now,就应该是until now they haven't been able - - --
-------- not - -- until
not 要搭配 until
youyouniao84 09:07:23
这就不知道了
palmaking 09:07:31
for a long time 搭配unable
youyouniao84 09:07:47
答案错了?
palmaking 09:07:52
unable不是否定词
youyouniao84 09:08:07

palmaking 09:08:26
至少,我是这样感觉的
youyouniao84 09:09:02