By the time Jack returned home from America, his son __________ from college.A．g
题型：不详难度：来源：
By the time Jack returned home from America, his son __________ from college.| A．graduate | B．has graduated | C．had graduated | D．had been graduated |
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答案
| C |
解析
| 考查时态。By与完成时连用，本题by后面是表示过去的时间，所以使用过去完成时。句意：到JACK回到美国的时候，他儿子已经大学毕业了。 |
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