-- ___________ did the important meeting ___________?
-- For about two hours.
| A．When; begin | B．How long; begin |
| C．When; last | D．How long; last |
-- ___________ did the important meeting ___________?
-- For about two hours.
| A．When; begin | B．How long; begin |
| C．When; last | D．How long; last |
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