—How long do you think it will be________man can finally solve the problem of cancer? —Well, it depends.

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问题 —How long do you think it will be________man can finally solve the problem of cancer?
—Well, it depends.

选项 A、when
B、until
C、after
D、before

答案D

解析句意：一你觉得人类还要多久才能解决癌症的问题? 一嗯，那还得看情况。“it will be…before…”是固定搭配，意思是“还要多久才……”。故本题应选D。

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