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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 考查名词性从句。句意为:专家们相信,人们只有当有必要购物时去买东西,这样才可以少浪费食物。believe后跟宾语从句,且宾语从句不缺任何成分。故选C项。
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