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Scientists ______that bacteria through microscopes for many years．
Scientists ______that bacteria through microscopes for many years．
admin
2011-06-28
52
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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本试题收录于：
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