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  3. We succeeded, after a good deal of______, in making this good kind of medicine for a cough.

We succeeded, after a good deal of______, in making this good kind of medicine for a cough.

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问题 We succeeded, after a good deal of______, in making this good kind of medicine for a cough.
选项 A、trial and error
B、morning and night
C、bitterness and hard
D、failure and success
答案A
解析 本题考查一组短语的区别。trial and error意为“反复试验”。morning and night意为“早晚”。bitterness and hard意为“艰难困苦”。failure and success意为“成功与失败”。trial and error为固定用法，指反复试验并经过多次失败，如：to cook by trail anderror．从反复试验中学习烧菜。
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