Perhaps there is still quite a long way to go______ these researchers can find a

游客2023-07-16 30

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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