填空题His efforts to improve the sales of this product have been very (help) ____.
填空题
His efforts to improve the sales of this product have been very (help) ____.
参考解析
解析：
本题考查词性转换。句意：他为提高产品销量而付出的努力成效很大。副词修饰形容词而不能修饰名词，应将名词help转化为形容词helpful。
本题考查词性转换。句意：他为提高产品销量而付出的努力成效很大。副词修饰形容词而不能修饰名词，应将名词help转化为形容词helpful。
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