15、Since the baby milk powder was found to be polluted, there has been universal doubt _____ other food products are safe to eat. 

A. whether             B. that                C. what             D. how

15、A.

解析： 考查名詞性從句.在 doubt 后面帶有同位語(yǔ)從句, 因含有“是否”之意, 故應(yīng)填whether。

請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
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