I’m afraid it will be two months.A when I come back B when I’ll come back C before I come

问题补充：

I’m afraid it will be two months.

A when I come back B when I’ll come back C before I come back D before I’ll come back

答案：

解析：这是it will be+时间+ before引导状语从句的句型，主句用了一般将来，从句用一般现在时表将来。

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