The research they had been devoted to ______ to be of great value to the cance
题型：不详难度：来源：
The research they had been devoted to ______ to be of great value to the cancer patients.| A．is proved | B．proves | C．has proved | D．proved |
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答案
| D |
解析
| 考查时态。句意：他们一直从事的研究证明对治疗癌症病人有巨大价值。they had been devoted to为后置定语从句。结合语境可知本句描述的是过去发生的动作，故用过去时态。选D。 |
举一反三
I was told that although these old buildings _______ the Qing Dynasty, they remained in good condition.| A．are dated back to | B．dated back to | | C．dating back to | D．have dated back to |
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–Where are you working now?
-In a big company. But I ___in a small workshop for 5 years in the countryside.| A．has worked | B．had worked | C．was working | D．worked |
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Mary,along with her parents,______to Paris.| A．have moved | B．has moved | C．are moving | D．have been moving |
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How long ______ teaching? Forty years.| A．he will have been | B．will have he been | | C．will have been he | D．will he have been |
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Many students preparing for the midterm examination.| A．are engaging in | B．are engaging themselves | | C．are engaging themselves | D．are engaged in |
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