题目内容
9. Our manager is an important customer now and he will be back this afternoon.
A. calling on B. calling up
C. calling in D. calling at
9. A下文说道:他下午回,显然此处不是与客户打电话,不宜选择B项;call on sb.意为"拜访某人";call at some place意为"访问某地";call in意为"招来;请来"。
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