To improve the quality of our products, we asked for suggestions ______ had used the products.

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问题 To improve the quality of our products, we asked for suggestions ______ had used the products.

选项 A、whoever
B、who
C、whichever
D、which

答案A

解析 whoever相当于anyone who,引导宾语从句;who只能作主语,不能作ask的宾语;C和D不符合。故选A。
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