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41. Scientists say it may be five or six years _____ this medicine is tested on human beings。
A. since
B. before
C. after
D. when
42. With larger numbers of graduates than ever before, just having a degree will no longer be enough to make you _____ in the crowd。
A. stand up
B. stand by
C. stand for
D. stand out
43. The doctor tried to do an experiment to find out the _____ of the medicine on the mice。
A. cause
B. result
C. reason
D. effect
44. This is only one of the laundries in the district _____ modern equipment。
A. that have
B. which have
C. that has
D. what has
45. Skating can be good for you _____ correctly。
A. though doing
B. though done
C. if done
D. if doing
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