30. —What______you _______at ten o' clock yesterday﹖ —I_______ in class. A、were doing studied B、was doing was studying C、were doing was studying D、was doing studied

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30. —What______you _______at ten o' clock yesterday﹖ —I_______ in class.
   A、were doing studied
   B、was doing was studying
   C、were doing was studying
   D、was doing studied

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