题文
— When did the meeting begin?
—At four o’clock．It ______ for 15 minutes．
| A．was on | B．began | C．has been on | D．has begun |
— When did the meeting begin?
—At four o’clock．It ______ for 15 minutes．
| A．was on | B．began | C．has been on | D．has begun |
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