托业考试

试题来源：托业-4
【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

参考答案：A
网考网解析：
To call on means to request or visit. Choice (B) m... 查看试题解析出处>>