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题目内容
（中国石油大学- 《大学英语3》）
)
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
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