问题
单项选择题
While I was in the university, I learned taking a photo,（）is very useful now for me.
A.it
B.which
C.that
D.what
答案
参考答案：B
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While I was in the university, I learned taking a photo,（）is very useful now for me.
A.it
B.which
C.that
D.what
参考答案：B