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МатематикаВопрос:
3 perform a Dr Stephens ......... an experiment while his students were watching him. b Dr Stephens ......... a lot of experiments before he made an important discovery. c Two weeks ago Dr Stephens an experiment with the help of some university students.
Ответ:
a Dr Stephens was performing an experiment while his students were watching him.
b Dr Stephens had performed a lot of experiments before he made an important discovery.
c Two weeks ago Dr Stephens performed an experiment with the help of some university students.
Ответ:
a) was performing, b) had performed, c) performed
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