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 题目和参考答案——青夏教育精英家教网—

题目内容

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

解析： 考查名词性从句.在 doubt 后面带有同位语从句, 因含有“是否”之意, 故应填whether。

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A．before

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