托业考试

试题来源：托业-4
【单选题】 Clients are invited to write______ call for additional information.
A．(A) but
B．(B) or
C．(C) not
D．(D) either

参考答案：B
网考网解析：
Or indicates a choice between items. Choice (A) indicates a contrast between items. Choice (C... 查看试题解析出处>>