问题补充:
---Where were you when I called at your house this morning?
---Oh, I for a friend from Tokyo at the airport.
A. had waited
B. am waiting
C. have waited
D. was waiting
答案:
A. had waited
B. am waiting
C. have waited
(答案→)D. was waiting
解析:可联系答.案.网客服索取。