A nature reserve for white－flag dolphins was set up in 1992, ________ boats have been
prohibited from sailing around since then.
| A．where | B．which | C．when | D．what |
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A nature reserve for white－flag dolphins was set up in 1992, ________ boats have been
prohibited from sailing around since then.
| A．where | B．which | C．when | D．what |
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