but,___the archaeologists have been unalbe

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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

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

He might have been killed ___the arrival of the police but how have you been though? How many times ___you ___the South Pole?A have ,been to B ha when I got to the place ___the town ought to have been ,all ___the look on his face,the news must have been terrible. -----I wish I ___the meeting .-----But you didn't .A have at not only you but also he ___the exam.A have passed Bhas pass i have ever been to paradise,but i have never been to u歌名? I am sorry you have been waiting so long .BUT 英语翻译Photogrammetrists have been slow to embrace,but more imp We have been waiting____us,but he hasn't come yet. I have been defeated,but I do not care about.