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

— 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

B 【解析】试题分析：考查连词，and otherwise意思“否则”，and therefore意思“因此”，or perhaps意思“或许”，but luckily意思“但是幸运的是”，句子意思“我们丢失了做事方法，因此我们将不会做试验成功” 考点：考查连词

考点分析：

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