2. 外语
  3. Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.

Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.

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问题 Perhaps there is still quite a long way to go______ these researchers can find an answer to the mystery.
选项 A、unless
B、until
C、where
D、before
答案D
解析 句子结构 通过分析语意，我们可以知道前面的动作应该是发生在后一动作之前，所以得出D。
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大学英语四级

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