I am a better reader this year than I was last year because I ________ to hundreds of new concepts and ideas. A. had been exposed B. have been exposed C. was exposed D. have exposed

I am a better reader this year than I was last year because I ________ to hundreds of new concepts and ideas.
A. had been exposed
B. have been exposed
C. was exposed
D. have exposed

出自：山西财经大学英语3

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