It's hard to believe that some old textbooks ( ) ten years ago ( ) in our university today. A、publishing/ are been usedB、published/ are usingC、published/ are being usedD、having been published/ are being used
It's hard to believe that some old textbooks ( ) ten years ago ( ) in our university today.
A、publishing/ are been used
B、published/ are using
C、published/ are being used
D、having been published/ are being used
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