I had been working on math for the whole afternoon and the numbers before my eyes.A. swim

发布时间：2020-08-17 07:38:18

I had been working on math for the whole afternoon and the numbers      before my eyes.
A. swim
B. swam
C. swimming
D. had swum

网友回答

A. swim
(答案→)B. swam
C. swimming
D. had swum
解析：句意：我一整个下午都在做数学题，那些数字在我的眼前转。主句用过去完成进行时，所以后半句用一般过去时，只有这样才能具备“过去的过去”的条件。选B。
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