2. 外语
  3. In making market investigation, one should ______. The word "indispensable" in the first line means ______.

In making market investigation, one should ______. The word "indispensable" in the first line means ______.

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问题 In making market investigation, one should ______.
The word "indispensable" in the first line means ______.
选项 A、impossible
B、essential
C、advisable
D、available
答案B
解析 indispensable：(通常后接介词to)必不可少的，必需的。例如：Oxygen is indispensable to life. (氧气对生命来说是不可或缺的。)四个选项中只有B的意思最接近。
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