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GSC said that they had to try 80 times ___ they succeeded.应该

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GSC said that they had to try 80 times ___ they succeeded.应该填until还是 before
until这个词经常和not...until 配合使用,原句改成:GSc said that they did not succeed until they had to try 80 times.这是英语的习惯
这个句子中填before 最恰当,英语是语言,不是说哪个一定不对,我们只选最佳
记得给分哦