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The bird feeder (__) to keep squirrels from getting to the birdseed.
A. has design
B. is designed
C. was a designer
D. has been designing
参考答案与解析
答案:B
解析:考查时态语态。句意:设计小鸟喂食器的目的是为了防止松鼠吃鸟食。根据句意,应该用一般现在时,喂食器应该是被设计,用被动语态,故选B。