2. 外语
  3. We must______ that the experiment is controlled as rigidly as possible.

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

admin2014-07-20  37
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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