To improve the quality of our products, we asked for suggestions _____ had used the products.
A．whoeverB．whoC．whicheverD．Which
A
考查名詞性從句。本句結(jié)構(gòu)為ask sb for sth 所以后面從句為賓語從句，從句中缺少had used the products的主語，即使用這個產(chǎn)品的人。故排除CD，根據(jù)句意可知，無論是誰使用了產(chǎn)品我們都會向他們尋求建議。故選A
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