试题与答案

I had been working on math for the whole

题型:选择题

题目:

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

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:成人最常见的"左向右分流"先天性心脏病是房间隔缺损

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