2. 学历提升
  3. —This maths problem is easy ______.A. work out B. to be working out C. worked D.

—This maths problem is easy ______.A. work out B. to be working out C. worked D.

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问题 —This maths problem is easy ______.
选项 A. work out
B. to be working out
C. worked
D. to work out
答案D
解析这道数学题很容易解决。
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