Frank, where have you been? We _____ you since 2 o’clock.
| A．have been waiting for | B．are waiting for |
| C．had waited for | D．waited for |
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Frank, where have you been? We _____ you since 2 o’clock.
| A．have been waiting for | B．are waiting for |
| C．had waited for | D．waited for |
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