I had been working on math for the whole afternoon and the numbers before my eye
来源：网络
时间：
推荐文章
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
试题答案
C
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。句意：我一整个下午都在做数学题，那些数字在我的眼前晕眩。【考点定位】考查动词时态。