50. No sooner had we got to the top of the mountain ______ it began to rain .
A. when B. as C. than D. while
49. It must have rained last night , ______the ground is still wet.
A. so B. for C. or D. but
48. You may do it yourself , ______ask someone else to do it .
A. or B. and C. so D. yet
47. Nuclear science should be developed to benefit the people ______harm them.
A. more than B. other than C. rather than D. better than
46. The result of the experiment was bad , ______we decided to start another one.
A. for B. but C. and D. so
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
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
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
42. -Tea ______ coffee?
-Coffee ______no sugar , thank you .
A. or…but B. and…but C. or…and D. and…and
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