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SINCE 1980, SCIENTISTS IN THE WORLD ________A LOT...
SINCE 1980, SCIENTISTS IN THE WORLD ________A LOT OF THINGS TO FIGH...
ĐỀ CƯƠNG ON HK 1 LOP 12(KEYS)
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35.Since 1980, scientists in the world ________a lot of things to fight AIDS. A. have done B. are doing C. did D. had done
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35.
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ĐỀ CƯƠNG ON HK 1 LOP 12(KEYS)