.The manager entered the office and was happy to learn that four-fifths of the tickets ___.
| A．was booked | B．had been booked | C．were booked | D．have been booked |
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.The manager entered the office and was happy to learn that four-fifths of the tickets ___.
| A．was booked | B．had been booked | C．were booked | D．have been booked |
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