2. 学历提升
  3. —That was a difficult question, but Mary still ______ to work it out.A. did B. f

—That was a difficult question, but Mary still ______ to work it out.A. did B. f

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问题 —That was a difficult question, but Mary still ______ to work it out.
选项 A. did
B. failed
C. kept
D. managed
答案D
解析那是一个很难的问题，但是玛丽还是坚持将它解决了。
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