问题补充:
--What theywhen you got there, Tom?
--Sorry, I forget.
A. are; doing
B. were; doing
C. did; do
D. will; do
答案:
A. are; doing
(答案→)B. were; doing
C. did; do
D. will; do
解析:句意:当你到那儿时,他们正在做什么,汤姆?——抱歉,我忘了。结合语境可知上文描述的是过去某时正在做的动作,故用过去进行时态,选B。
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