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、secure
B、ensure
C、assure
D、issue

答案B

解析 题型:词汇题。此题考查动词词义。ensure确保,如:ensure success保证成功;还可以ensure sb. against (from)danger保护某人免受危险,issue为无关干扰词,意思是“发行;分配”;secure表示“保护,确保安全”,如: secure one’s life;assure意思是“保证,担保”。
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