He is______an important customer now and he will be back tonight.A、calling onB、

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问题 He is______an important customer now and he will be back tonight.

选项 A、calling on
B、calling up
C、calling at
D、calling for

答案 A

解析本题考查动词call与不同介词的搭配。call on指“号召(某人)，拜访(某人)”。callup指“打电话给”。call at指“访问(某地)”。call for指“要求，提倡”。根据句意，故选A。

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