问题描述：
Is this factory _____ some American friends paid a visit to last week? A. that B. where C. in whic
Is this factory _____ some American friends paid a visit to last week? A. that B. where C. in which D. the one
Is this factory _____ some American friends paid a visit to last week? A. that B. where C. in which D. the one
问题解答：
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