优优班--学霸训练营 > 知识点挑题
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            • 1．
              Professor Li said , “I did some research in this field yesterday . ”

              Professor Li said that _____ _______ ______some research in ______ field ______ _______ ______.

              难度：难
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            • 2．

              Olympics Games take place every four years.

              Olympics Games take place ________ ________ _______.

              难度：中等
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