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WE ... FOR THREE HOURS AND ARE VERY TIRED. A. ARE...
WE ... FOR THREE HOURS AND ARE VERY TIRED. A. ARE WALKING B. HAVE...
1000 CAU TRAC NGHIEM ANH 9
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42. We ... for three hours and are very tired. A. are walking B. have been walking C. were walking D. had been walking
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42.
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1000 CAU TRAC NGHIEM ANH 9