Cathy, this is Mike. I （） because I am going to meet some guests at the airport. So I will not have lunch. That’s OK. I will wait for you at supper time.

Cathy, this is Mike. I （） because I am going to meet some guests at the airport. So I will not have lunch. That’s OK. I will wait for you at supper time.
A.have telephoned
B.was telephoning
C.telephoned
D.am telephoning
正确答案：D