Experts believe ______ people can waste less food by shopping only when it is necessary.  
A．whyB．whatC．whereD．that
D

試題分析：句意：專家相信人們只有在必要的時(shí)候購(gòu)物能夠浪費(fèi)更多的食品。Believe后面接的是賓語(yǔ)從句，賓語(yǔ)從句中是完整的句子，不缺成分，用that連接，why“為什么”，what“什么”，where“哪里”，都不符合句意。選D。
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