题目列表(包括答案和解析)

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22.  Some researchers believe that there is no doubt ______a cure for AIDS will be found.

     A. which           B. whether         C. that                  D. what

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21.  He was about to tell me the secret ______ someone patted him on the shoulder.

     A. as               B. while            C. when                D. until

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20.  ______ you’re tried it, you can’t imagine how pleasant it is.

     A. When           B. Although        C. Because              D. Unless

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19. For miles around me there was nothing but a desert, without a single plant or tree ______.

     A. on earth         B. in sight          C. at a distance         D. in place

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18.  More and more people choose to shop in a supermarket as it offers a great ____ of goods.  

A. expression         B. mixture        C. variety          D. combination

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17.  So difficult ______ it to live in an English-speaking country that I determined to learn      English. 

A. did I feel         B. I have felt        C. have I felt            D. I did feel

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16.  For a moment nothing happened. Then  ______all shouting together.

     A. voices had came B. did voices come      C. came voices     D. voices would come

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15. -How long are you staying?

   -I don’t know. ______.

     A. That’s ok        B. It depends       C. Never mind           D. It doesn’t matter

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14.  Whatever work you are doing, you should concentrate your attention ______it.

     A. to               B. towards         C. with                 D. on

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13. The incomes of skilled workers went up. _____, unskilled workers saw their earnings fall.

     A. Moreover        B. Therefore        C. Meanwhile           D. Otherwise

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