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

A.discussesB.discussed

C.is discussingD.was discussing

【答案】D

【解析】

當(dāng)我到那的時(shí)候，杰克正在跟他的朋友們討論一個(gè)數(shù)學(xué)問題。

考查動(dòng)詞時(shí)態(tài)辨析。discusses 一般現(xiàn)在時(shí)；discussed 一般過去時(shí)；is discussing現(xiàn)在進(jìn)行時(shí)；was discussing 過去進(jìn)行時(shí)。when是引導(dǎo)的時(shí)間狀語從句，根據(jù)句意，當(dāng)我到那的時(shí)候，他正在跟他的朋友們討論一個(gè)數(shù)學(xué)問題，所以主句用進(jìn)行時(shí)。從句中got是一般過去時(shí)，所以主句用過去進(jìn)行時(shí)。故選D。

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