Experts believe________people can waste less food by shopping only when it is necessary.                                                             (2013·北京，33)
A．whyB．where
C．thatD．what
C
解析　考查名詞性從句。句意為：專家們相信，人們只有當(dāng)有必要購物時(shí)去買東西，這樣才可以少浪費(fèi)食物。believe后跟賓語從句，且賓語從句不缺任何成分。故選C項(xiàng)。
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