______around the university, we then were taken to a building, ______ many scientists worked.
| A．Showing; where | B．Having been shown; where |
| C．Having shown; which | D．Being shown; that |
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______around the university, we then were taken to a building, ______ many scientists worked.
| A．Showing; where | B．Having been shown; where |
| C．Having shown; which | D．Being shown; that |
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