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 –Withthefailureoftheexperiment,wehavereachedadeadend.-...

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 –Withthefailureoftheexperiment,wehavereachedadeadend.-...

  –With the failure of the experiment, we have reached a dead end.

--Cheer up! Many good things would never have happened if the bad events       first.

A. don’t happen     B. didn’t happen    C. hadn’t happened     D. haven’t happened

【回答】

C

知識點:動詞時態與語態

題型:選擇題

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