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Ihadbeenworkingonmathforthewholeaftensoonandthenumbersbeforemyeyes.[]A.swimB.swumC.swamD.hadswum

题目详情
I had been working on math for the whole aftensoon and the numbers        before myeyes.
[     ]
A. swim          
B. swum          
C. swam          
D. had swum
I had been working on math for the whole aftensoon and the numbers        before myeyes.
[     ]
A. swim          
B. swum          
C. swam          
D. had swum
I had been working on math for the whole aftensoon and the numbers        before myeyes.
[     ]
A. swim          
B. swum          
C. swam          
D. had swum I had been working on math for the whole aftensoon and the numbers        before myeyes. I had been working on math for the whole aftensoon and the numbers        before myeyes.       
[     ]
[     ]
[     ]
A. swim          
B. swum          
C. swam          
D. had swum A. swim          
B. swum          
C. swam          
D. had swum


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答案和解析
C
C C C C