You ____fail to pass the extrance examination if you don't study harderA shallB couldC mustD should

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You____failtopasstheextranceexaminationifyoudon''tstudyharderAshallBcouldCmustDshouldYou____failtopas

You ____fail to pass the extrance examination if you don't study harderA shallB couldC mustD should
You ____fail to pass the extrance examination if you don't study harder
A shall
B could
C must
D should

You ____fail to pass the extrance examination if you don't study harderA shallB couldC mustD should
选D.是虚拟语气.用shall的完成时should.
绝对正确.

选d 虚拟语气