— 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.

题型：单选题题类：常考题难易度：普通

天津市耀华中学2018届高三上学期英语第二次月考试卷

— 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

举一反三

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