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-What a shame!It turned out to be a failure. -We missed a process. we could not

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-What a shame!It turned out to be a failure. -We missed a process. we could not

—What a shame!It turned out to be a failure.

—We missed a process,________ we could not succeed in the  experiment.

A. and otherwise B. and therefore

C. or perhaps    D. but luckily

 

试题答案

B

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