2. 专升本
  3. It is necessary that all the facts ______ before we go about writing the article.

It is necessary that all the facts ______ before we go about writing the article.

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问题 It is necessary that all the facts ______ before we go about writing the article.
选项 A、check
B、be checked
C、checked
D、must be checked
答案B
解析
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