与语法关系不多,更多的是语意.他们可能正在准备（这件事）.这里该用主动不用被动,所以不是be prepared for,因为是正在准备不是可能要准备所以不是prepare for. They might prepare for it语法方面也正确,但是和原句意思不同,他们可能会准备的.

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