The factory the students visited last week is the one I have worked for thee years．A. th

问题补充：

The factory the students visited last week is the one I have worked for thee years．

A. that; which

B. when; in which

C. /; where

D. which; that

答案：

A. that; which

B. when; in which

(答案→)C. /; where

D. which; that

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