The manager said that they had an _____ plan if the plan they had submitted was not accepted.A.alternateB.alternativeC.absoluteD.appreciable
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B解析 alternative 可提供选择的，两者挑一的：alternate交替的：1)There was no alternative route open to her. (在她面前没有另外可供选择的路线。)2)French and English are not alternative courses; but may be taken in the same year.(语法和英语并不是交替开设的课程；而可以在同一年里选修。)