题目内容

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 completely recovers.
A.after; whenB.before; since C.that; whenD.since; before
D
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)故答案为D。
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