7.While I was in the university, I learned taking a photo, __B__ is very useful now for me.(3分) A. it B. which C. that D. what

7.While I was in the university, I learned taking a photo, __B__ is very useful now for me.(3分)
A. it
B. which
C. that
D. what

出自：西北大学大学英语（上）

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