It'llbealongtime________Mr.Black

发布时间：2020-07-15 08:20:42

It'll be a long time ________ Mr. Black ________ back from abroad.A.before; esB.since; has eC.before; will eD.after; will e

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A解析解题思路：It'll be a long time before…句型中before引导的时间状语从句用一般现在时表一般将来时．
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