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—Meimei is ________ the difficult math problem. —I'm sure she'll ________. A. working out；work it ou...
题目内容：
—Meimei is ________ the difficult math problem.
—I'm sure she'll ________.
A. working out；work it out B. working on；work it out
C. working on；work it on D. working out；work it on
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