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to improve the quality of our products ,we asked for suggest

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to improve the quality of our products ,we asked for suggestions_______had used the products
A whoever B who C whichever D which
为什么不能选B 两者有什么区别.
to improve the quality of our products ,we asked for suggest
to improve the quality of our products,we asked for suggestions (whoever) had used the products...
为提高我们的产品质量,我们向(无论是谁,即)所有使用过产品的用户征求意见...
如果用who这个范围就不一样,whoever是不哪个用过本产品的用户,即所有,有强调之意,而who则没有这层意思
再问: 那如果用WHO的话 意思有什么不同