问题
选择题
—How often do I need to feed the fish?
-They food every day, or they will be hungry.
A.must give
B.mustn’t give
C.mustn’t be give.
D.must be given
答案
答案:D
题目分析:句意:你多久喂一次鱼?他们每天都必须被喂食,否则他们会饿。主语they指鱼,是动作的承受者,故用被动结构:be + done,含有情态动词的被动结构:情态动词+ be + done,结合句意及句子结构,故选D