Before the first nonstop flight made in 1949,it______necessary for all planes to
题型：不详难度：来源：
Before the first nonstop flight made in 1949,it______necessary for all planes to land for refueling.| A．would be | B．has been | C．had been | D．would have been |
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答案
| C |
解析
| 本题时间状语从句为一般过去时，主句的情况是在从句之前，是“过去的过去”，因此用过去完成时。 |
举一反三
I wonder if she______us,but I think if she______us we will be able to complete the task ahead of time.| A．helps;helps | B．will help;has helped | | C．helps;will help | D．will help;helps |
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The population of the city ________from less than half a million in 1949 to over two million.| A．have increased | B．has increased | C．have improved | D．has improved |
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—Didn"t the teacher see him entering the classroom?
—No, he_______ on the blackboard.| A．was writing | B．had written | | C．wrote | D．is writing |
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—Which hotel are you in?
—I____ in a hotel. A friend I met on the train ____ to put me up for a couple of nights.| A．haven’t stayed; has offered | B．am not staying; offered | | C．am not staying; is offering | D．do not stay; offers |
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I _______ in a foreign company for five years. Still, I don’t regret giving up the well-paid job.| A．worked | B．have worked | | C．was working | D．had worked |
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