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

单选题
2022-01-06 20:24
A、used to taking
B、used to take
C、is used to take
D、was used to
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正确答案
B

试题解析
答案为B。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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