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50. No sooner had we got to the top of the mountain ______ it began to rain .

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

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49. It must have rained last night , ______the ground is still wet.

  A. so           B. for              C. or           D. but

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48. You may do it yourself , ______ask someone else to do it .

  A. or           B. and             C. so           D. yet

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47. Nuclear science should be developed to benefit the people ______harm them.

  A. more than      B. other than         C. rather than    D. better than

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46. The result of the experiment was bad , ______we decided to start another one.

  A. for              B. but                 C. and          D. so

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45. I’d like to stop working ______I’ve got a lot of work still to do .

  A. because       B. though           C. and          D. so

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44. The lady thought I was talking about her daughter , ______ , in fact , I was talking about my daughter.

  A. whom        B. where           C. which        D. while

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43. If it doesn’t fit you , bring it back______ we’ll give you your money back.

  A. but           B. because          C. since        D. and

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42. -Tea ______ coffee?

  -Coffee ______no sugar , thank you .

  A. or…but       B. and…but         C. or…and          D. and…and

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