Iregrethardatschool,orIwouldha

I regret _____ hard at school, or I would have succeeded in passing the exam.

A．not to work

B．having not worked

C．to have not worked

D．not having worked

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A．trying on

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C．to try on

D．to try out

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—_______!

A．No comment

B．No doubt

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B．when

C．before

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—Yes, by all means．Take care．

A．in

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