2. 外语
  3. I regret to say that your thesis requires more thinking than ______ for the problem is exceedingly complex.

I regret to say that your thesis requires more thinking than ______ for the problem is exceedingly complex.

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问题 I regret to say that your thesis requires more thinking than ______ for the problem is exceedingly complex.
选项 A、to be put in
B、has been put in
C、being put in
D、have been put in
答案B
解析
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