We must______that the experiment is controlled as rigidly as possible.

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问题 We must______that the experiment is controlled as rigidly as possible.

选项 A、assure
B、secure
C、ensure
D、issue

答案C

解析 assure:(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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本试题收录于: 英语题库普高专升本分类
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