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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英语

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