You must remember that you feed the fish much.A. don’t need toB. needn’t toC. don’t needD

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(答案→)A. don’t need to
B. needn’t to
C. don’t need
D. not need
解析：考查need的用法。作实义动词是，后跟to do，借助于助动词变否定；作情态动词时，后跟动词原形，加not变否定。所以选A。