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A
assure
B
secure
C
ensure
D
issue
正确答案 :C
解析
【翻译】我们必须确保实验尽可能严格地进行。 [考点]词义辨析 【精析】Cassure:(v.)使确信,使信服,后面常接人作宾语;secure:(adj.)安全的,无虑的;ensure:(v.)保证,确保,后面可以接从句作宾语;issue:(v.)发行,发布。根据句意可知,选C。
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