—You were out when I dropped in at your house.
—Oh, I_______ for a friend from England at the airport.
| A．was waiting | B．had waited | C．am waiting | D．have waited |
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—You were out when I dropped in at your house.
—Oh, I_______ for a friend from England at the airport.
| A．was waiting | B．had waited | C．am waiting | D．have waited |
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