托业考试

试题来源：托业-4
【单选题】 Our company ______ Metro Messenger Service since 1998.
A．(A) use
B．(B) used
C．(C) had used
D．(D) has been using

参考答案：D
网考网解析：
An action that has been happening in the past and ... 查看试题解析出处>>