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A
in
B
at
C
for
D
on
正确答案 :D
解析
【翻译】实验中,我们仔细观察进展并做了详细的记录。 [考点]词语搭配 【精析】D keep an eye on是固定搭配,意为“留意,注视”,在本句中表示“仔细观察”。故选D。
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