It may be many years _______ the economic situation improves

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It may be many years _______ the economic situation improves.A) when B) that C) after D) before
It may be many years _______ the economic situation improves.
A) when B) that C) after D) before
这里为什么不能用when

翻译：经济状况改善前还得有好些年
从句the economic situation improves用一般现在时表将来,动作的时点在将来
四个选项都是连接时间状语从句
when表示“当”,前后连接的句子通常时间相差不大,动作通常同时进行,但经济状况改善前必须有好些年,说明动作时间存在差异.
It's...that 连接强调句去掉之后句子不变化many years前加in 可以选
after表示在..之后,通常连接表过去或完成的动作
before表在..之前,当主句的时间就是现在或将来,从句这个时候就要用将来时态了,通常用现在时表将来. 选before

It may be many years _______ the economic situation improves it may be many years before the situation in that area impro Because of the bad economic situation,many workers from the It may be many years ______ we meet again.A.after B.before C people may live_____(be)200 years old in many years. At the monent,it may be difficult to imagine,but many people Once environmental damage _______,it takes many years for th 6 .Once environmental damage _______,it takes many years for 翻译：The situation is bad,but it could be worse. In recent years,the economic development of the world has be Recent ＿＿＿＿＿in the country suggest that the situation may be it may be 5 or 10 years away.( ）