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  3. —Mr. John was busy, ______he could not come.A. but B. therefore C. and D. nor

—Mr. John was busy, ______he could not come.A. but B. therefore C. and D. nor

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问题 —Mr. John was busy, ______he could not come.
选项 A. but
B. therefore
C. and
D. nor
答案B
解析约翰先生非常忙，所以他不能来了。
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