Feel free to ______the engineer for more assistance.

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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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