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Since many insects have already become（）to DDT, scientists have to look for some new insecticide
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Since many insects have already become（）to DDT, scientists have to look for some new insecticide
A、active
B、resistant
C、tough
D、gradual
时间：2022-01-02 14:16
关键词：
成人本科学位英语
答案解析
A
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