Choose the ONE that best completes the sentence. Then mark the corresponding letter on the Answer Sheet. 21. A nuclear war would set()the development of all countries by centuries. A. off B. down C. aside D. back

Choose the ONE that best completes the sentence. Then mark the corresponding letter on the Answer
Sheet. 21. A nuclear war would set()the development of all countries by centuries.
A. off
B. down
C. aside
D. back

出自：乐山师范学院应用化学

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