2. 专升本
  3. It took them more than ten years to ______ the defensive works.

It took them more than ten years to ______ the defensive works.

admin2020-06-20  14
问题 It took them more than ten years to ______ the defensive works.
选项 A、build
B、build into
C、build on
D、build up
答案D
解析
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