27. She... (to write) letters yesterday at 5 p.m. A. has written B. is writing C. was writing D. wrote O A C OB OD 28. happens when the environment is dirtied, by waste, chemicals, and other harmful substances. A. pollution B. damage C. ecology D. climate​

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Ответ дал: sayana1170
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Ответ:

27)A)has written

28)A)pollution

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