2.There are times when you find yourself unable to work out a problem and it is at this ________that the way in which you use your teacher is important.( )
A. | course | B. | point | C. | thought | D. | opportunity |
15.After a careful survey about the cause of the newly-built bridge,they finally came to a(n) _________ that it was due to the heavy rain.( )
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A. | construction | B. | motivation | C. | conclusion | D. | impression |