2. 外语
  3. What the author discussed in the previous section is most probably about ______. A necessary cause is ______.

What the author discussed in the previous section is most probably about ______. A necessary cause is ______.

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问题 What the author discussed in the previous section is most probably about ______.
A necessary cause is ______.
选项 A、one without which it is impossible for the effect to occur
B、one of the causes that can produce the effect
C、one that is enough to make the effect occur
D、none of them
答案A
解析 第三段的第二句话即阐明“a necessary cause”的含意。
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