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【题目】Jack ________ a math problem with his friends when I got there.

A.discussesB.discussed

C.is discussingD.was discussing

【答案】D

【解析】

当我到那的时候,杰克正在跟他的朋友们讨论一个数学问题。

考查动词时态辨析。discusses 一般现在时;discussed 一般过去时;is discussing现在进行时;was discussing 过去进行时。when是引导的时间状语从句,根据句意,当我到那的时候,他正在跟他的朋友们讨论一个数学问题,所以主句用进行时。从句中got是一般过去时,所以主句用过去进行时。故选D

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