By the time Jack returned home from England，his son ________ from college.(2011·辽宁)
| A．graduated | B．has graduated |
| C．had been graduating | D．had graduated |
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By the time Jack returned home from England，his son ________ from college.(2011·辽宁)
| A．graduated | B．has graduated |
| C．had been graduating | D．had graduated |
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