Experts believe people can waste less food by shopping only when it is necessary.
A. why
B. what
C. where
D. that
网友回答
A. why
B. what
C. where
(答案→)D. that
解析:句意:专家相信人们只有在必要的时候购物能够浪费更多的食品。Believe后面接的是宾语从句,宾语从句中是完整的句子,不缺成分,用that连接,why“为什么”,what“什么”,where“哪里”,都不符合句意。选D。