摘要：30．Is this research center you saw the modern equipment last year? A．which B．that C．the one where D．the one that
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Is this research center ________ you saw the modern equipment last year?
[ ]
A．which
B．that
C．the one that
D．the one where
Is this research center ________ you saw the modern equipment last year?
[ ]
A．which
B．that
C．the one that
D．the one where