His efforts to improve the sales of this product have been very (help) ______.he

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问题 His efforts to improve the sales of this product have been very (help) ______.

选项

答案 helpful

解析根据句子结构，这里缺一形容词做表语。

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Thechairmanofthecompanysaidthatnewtechniqueshad______improvedtheirpro