--What       they       when you got there, Tom?
--Sorry, I forget.
A．a(chǎn)re; doingB．were; doingC．did; doD．will; do
B

試題分析：句意：當(dāng)你到那兒時(shí)，他們正在做什么，湯姆？——抱歉，我忘了。結(jié)合語境可知上文描述的是過去某時(shí)正在做的動(dòng)作，故用過去進(jìn)行時(shí)態(tài)，選B。
點(diǎn)評(píng)：英語中的時(shí)態(tài)主要是借助于時(shí)間狀語與上下文語境來進(jìn)行判斷。解答此類題型，首先要注意句子中的時(shí)間狀語，如果沒有則要通過分析上下文，結(jié)合語境來判斷句子的時(shí)態(tài)。
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