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  3. —I won’t be free ______I finish this work.A. after B. until C. but D. when

—I won’t be free ______I finish this work.A. after B. until C. but D. when

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问题 —I won’t be free ______I finish this work.
选项 A. after
B. until
C. but
D. when
答案B
解析我不确定我什么时候能完成这次工作。
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