By the time Jack returned home from England, his son _______ from college.A．gr
题型：不详难度：来源：
By the time Jack returned home from England, his son _______ from college.| A．graduated | B．has graduated | C．had been graduating | D．had graduated |
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答案
| D |
解析
试题分析：句意：当杰克从英国回家为止，他的儿子已经从大学毕业了。by the time …当……的时候，……
通常引导一个时间状语从句，表示“到……的时候”主句则表示在此时间之前某个事件已完成。值得注意的是，当从句用过去时时，主句通常用过去完成时。选D。 |
举一反三
Yangzhou high school ___________ since 1902. | A．has come into existence | B．has been existed | C．has been in existence | D．began to exist |
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A new kind of drug ___ ___ to cure H7N9 bird flu by the scientists and they are hopeful that they will succeed in a couple of weeks. | A．has been developed | B．is being developed | C．is developing | D．has developed |
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By the time I see you again, I _______ from that school.| A．have graduated | B．graduated | C．will have graduated | D．graduate |
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—Ann is in hospital.
—Oh, really? I ________ know. I ________ go and visit her. | A．didn"t; am going to | B．didn"t; will | C．don"t; will | D．don"t; would |
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----Are you a teacher?
----No, but I ______ in Harbin No. 3 High School for 3 years.| A． had taught | B．has taught | C．teach | D．taught |
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