Years ago we didn"t know this, but recent science ______ that people who don"t s

Years ago we didn"t know this, but recent science ______ that people who don"t s

题型:不详难度:来源:
Years ago we didn"t know this, but recent science ______ that people who don"t sleep well soon get ill.
A.showedB.has shownC.will showD.is showing

答案
B
解析
考查动词的时态。根据句子中的recent science可以知道句子中“含有过去发生的动作”对现在产生的影响。所以答案应该用现在完成时。
举一反三
The policeman"s attention was suddenly caught by a small box which ______ placed under the Minister"s car.
A.has beenB.was beingC.had beenD.would be

题型:不详难度:| 查看答案
Susan decided not to work on the program at home because she didn’t’ want her parents to know what she __________.
A.has doneB.had doneC.was doingD.is doing

题型:不详难度:| 查看答案
According to the art dealer, the painting ______  to go for at least a million dollars.
A.is expectedB.expectsC.expectedD.is expecting

题型:不详难度:| 查看答案
— The food here is nice enough.
— My friend ______ me a right place.
A.introduces B.introducedC.had introduced D.was introducing

题型:不详难度:| 查看答案
--Do you want a lift home?
---It’s very kind of you, but I have a much late in the office. I overslept this morning because my morning clock _______.
A.doesn’t go offB.won’t goneC.wasn’t going offD.didn’t go on

题型:不详难度:| 查看答案
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