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his plan seemed to be too difficult,but___it proved to be pr

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his plan seemed to be too difficult,but___it proved to be practicable.
这题答案是before long,我知道是对的,但是我疑惑的是选shortly after 为什么不可以,我觉得意思也对啊!
his plan seemed to be too difficult,but___it proved to be pr
efore long 可以独立做时间状语,而shortly after 后要跟时间状语
eg：The fight broke off shortly after sunset.
战斗在太阳落山后不久突然停止了.
本题显然没有时间状语,所以用before long
His theory proved to be right. the operation proved to be very difficult.it proved to be __ plan A have proved to be a failure. proved to be用法 The job proved to be much more difficult than I________ 一：Their plan ____ to be a perfect one.A.proved B.was proved选 The search proved difficult和The search proved to be difficul ______ was his advice that it proved to be worthless. seemed to be deeply struck by his skill The operation proved to be very difficult这句中的prove是什么意思?它和Th The job proved to be much more difficult than I had expected the task we had just completed proved to be more difficult t