问题
选择题
I had been working on math for the whole afternoon and the numbers before my eyes. [ ]
A. swim
B. swum
C. swam
D. had swum
答案
答案：C
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I had been working on math for the whole afternoon and the numbers before my eyes. [ ]
A. swim
B. swum
C. swam
D. had swum
答案：C