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问题: 单选15

The work _______ a lot of patience.
A. calls on B. calls in C. calls back D. calls for

解答:

The work _______ a lot of patience.
A. calls on 号召;拜访B. calls in请回 C. calls back收回;回电 D. calls for 需要
翻译一下:这项工作需要很好的耐性.
选D