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题目
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If a computer crashes, you will lose the file you _________unless you save it regularly.
A.are workingB.workC.will workD.worked

答案
A
解析

核心考点
试题【.If a computer crashes, you will lose the file you _________unless you save it r】;主要考察你对一般现在时等知识点的理解。[详细]
举一反三
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To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.  
A.has inventedB.had inventedC.inventsD.is inventing

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In the rainforest of the Amazon, 50 to 150 plant species _____ every day.
A.have been destroyedB.are destroyingC.are being destroyedD.destroyed

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We won’t know how much food to buy until we decide how many people ________.
A.were comingB.are comingC.have been coming D.had come

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My brother left home five years ago. I _______ nothing from him up to now.
A.hearB.heardC.have heardD.had heard

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The day — my birthday — I had been looking forward to _______ at last.
A.comeB.comingC.has comeD.came

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