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题目
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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

答案
A
解析

核心考点
试题【.To help today’s customers make a choice, a company in New York _____a video tro】;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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In the rainforest of the Amazon, 50 to 150 plant species _____ every day.
A.have been destroyedB.are destroyingC.are being destroyedD.destroyed

题型:不详难度:| 查看答案
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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

题型:不详难度:| 查看答案
.
The day — my birthday — I had been looking forward to _______ at last.
A.comeB.comingC.has comeD.came

题型:不详难度:| 查看答案

Every pupil is ______to be in the classroom at 7.am.
A.supposedB.being supposed
C.supposingD.to suppose

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