2. 外语
  3. All I can say about them ______ that they are the most competent engineers I have ever seen.

All I can say about them ______ that they are the most competent engineers I have ever seen.

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问题 All I can say about them ______ that they are the most competent engineers I have ever seen.
选项 A、have
B、has
C、are
D、is
答案D
解析 All I can say about them是从句作主语，看作单数，故用单数动词。
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