单选题
Feel free to ______the engineer for more assistance.
A、
(A) call on
B、
(B) call to
C、
(C) call forward
D、
(D) call at
【正确答案】
A
【答案解析】
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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