I’m sorry to tell you it is nearly five months ___ smith got injured in the leg, but I think it won’t be long ____ he pletely recovers.A.after; whenB.before; sinceC.that; whenD.since; before
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D解析考查固定句型。It is +一段时间+since 从句 （一般过去时） It won’t be long before +从句 （一般现在时）故