We must______ that the experiment is controlled as rigidly as possible.A、secure

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问题 We must______ that the experiment is controlled as rigidly as possible.

选项 A、secure
B、ensure
C、assure
D、issue

答案 B

解析此题考查动词词义。ensure 确保。issue为无关干扰词，发行：分配。

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