I’m sorry to learn that you have made no (improve)______on the plan at all.impro

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问题 I’m sorry to learn that you have made no (improve)______on the plan at all.

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答案 improvement

解析由空格前的no可推断，此处应该填一个名词与前面动词made构成搭配，由动词improve派生出来的名词是improvement“改进，改善”。

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