The biologist admitted ______ excessive numbers of animals in laboratory tests.A

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问题 The biologist admitted ______ excessive numbers of animals in laboratory tests.

选项 A、using
B、being used
C、to use
D、used

答案 A

解析 admit后要求接动名词做宾语，首先排除C和D选项，与主语的关系又是主动的，因此B项也是错误的。

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