If I ___ young again,I would study harder.

A.were to be B.should be
请问这题为什么要选A呢?B怎么不行呀??
请大家详细地解答一下,谢谢~~`!
B也是虚拟语气啊!!!从句should+动词原形或were to+动词原形
不是这样的吗??

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