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  3. Scientists ______that bacteria through microscopes for many years．

Scientists ______that bacteria through microscopes for many years．

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问题 Scientists ______that bacteria through microscopes for many years．
选项 A、studied
B、have studied
C、had studied
D、have seen studied
答案B
解析 本题考查时态的用法。由于句中已有“for many years”，故应用现在完成时。
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