55. While I was in the university, I learned taking a photo, _____is now very useful for me. 我在大学的时候学习过摄影，这对我很有用。 A. it B. which C. that D. what

55. While I was in the university, I learned taking a photo, _____is now very useful for me. 我在大学的时候学习过摄影，这对我很有用。
A. it B. which C. that D. what

出自：东华大学大学英语4

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