It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.

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问题 It ______ 12 rabbits to test a sample of vaccine, now it takes only 6.

选项 A、used to taking
B、used to take
C、is used to take
D、was used to taking

答案B

解析过去曾经需要12个兔子测试疫苗样本，现在只需要6个。used to do“曾经”； be used to doing sth．“习惯于做某事”。

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