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:使(某人)确信(某事),后面常跟人作宾语;ensure:确保,使安全,后面可以接从句作宾语;secure:使安全;issue:发行,发布。根据句意可知,选C。
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