Up to now, our society ________ with limited living space and a shortage of nat
题型：不详难度：来源：
Up to now, our society ________ with limited living space and a shortage of natural resources.| A．has been challenged | B．is being challenged | | C．is challenging | D．has challenged |
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答案
| A |
解析
| A 考察动词时态和语态。句义：到目前为止，我们的社会一直面试着生存生成空间有限和自然资源匮乏的挑战。Sb/sth be challenged with sth意为“某人/某物面临着…挑战”，为习惯用法；根据时间状语up to now可知，应用现在完成时。故A正确。 |
举一反三
The house is dirty because it ________ since they moved out.| A．doesn"t clean | B．isn"t cleaned | | C．hasn"t cleaned | D．hasn"t been cleaned |
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I know little about the accident because not much ______ about it up to now.| A．has said | B．has been said | C．had said | D．had been said |
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Barrack Obama __________ President of the United States since 2010.| A．became a | B．has become a | C．has turned | D．has been |
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The famous reporter, who is said to go back to America next month, _____in China for almost twenty years. | A．lived | B．was living | C．has lived | D．had lived |
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