How much does a short?wave radio cost?

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How much does a short?wave radio cost?
Sorry,I’m not sure.I’ll______ and tell you tomorrow.
A.find B.know C.understand D.find out

作“发现”解find out=to learn of;discover a fact that was hidden by study,calculation,inquiry,etc.通过研究、计算、询问来“获知、得知、探知”隐蔽起来的事实.而find=get or discover（sb./sth.,not lost,forgotten,etc.） after search,experience,effort通过搜寻、体验、努力“找到、发现”某人或某物.
答案：D

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