It was in 2,000,he was working at the research center,he made the_英语解答

It was in 2,000,he was working at the research center,he made thescientific discovery.
A.when,when B.that,where C.which,when D.when,that

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解答

B,前面是强调句型中的that,后面where做the research center地点状语的先行词