Feel free to______the engineer for more assistance.A、call onB、call toC、call fo

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问题 Feel free to______the engineer for more assistance.

选项 A、call on
B、call to
C、call forward
D、call at

答案 A

解析 To call on means to request or visit. Choice(B)means to get someone’s attention by shouting to them. Choices(C) and(D)are not two-word verbs.

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MemorandumTo:JuanGomezFrom:MariaJohnson,BuildingEngineerDate:17Jan.2