单选题：We all know that we ________ our carbon footprint, but I su..

题目分类：情态动词
题目类型：单选题
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We all know that we ________ our carbon footprint, but I suspect that many people wouldn't be prepared to go as far as Joan Pick, a retired scientist living in south London.A．must have reducedB．should have reducedC．may have reducedD．could have reduced

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We hadn't waited for long _____ the bus pulled up at the bu..

We hadn't waited for long _____ the bus pulled up at the bus stop.A. until B. since C. before D. once

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I didn't realize my mistake ____ my teacher had a face

I didn't realize my mistake ____ my teacher had a face-to-face talk with me.A. untilB. afterC. since D. when

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I have heard these sons and daughters say they never fully a..

I have heard these sons and daughters say they never fully appreciated their parents _____ it was too late to tell them.A. as B. thatC. until D. when

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It was dark and Ithat woman___ my mother,for..

It was dark and I________that woman___________ my mother,for they have the same hairstyle.[ ]A. mistook ; asB. mistook ; forC. took ; asD. took; for

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(2014·郑州一检)—Who is late for class again?—________you as..

(2014·郑州一检)—Who is late for class again?—________you ask？Tim，of course.A．Can　B．WouldC．Could　D．Need

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