These boxes ______ for keeping the food clean and cool.
A. use B. are used C. have used D. were using
B
【解析】
试题分析:句意:这些箱子是用来保持食物清洁和保鲜的。结合语境可知本句描述的是客观性动作,故用一般现在时态。主语是动作对象,故用被动语态,选B。
Liu Xiang ________by his coach to train regularly.
A.advised B.advises C.was advised D.be advised