问题描述：
Is_in this factory,_is in the possesion of Mr.Smith_several foreign experts are working?
A.it;where;that B.that;that;where C.it;which;where D.it;who;which请说明一下为什么选C.
A.it;where;that B.that;that;where C.it;which;where D.it;who;which请说明一下为什么选C.
问题解答：
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