单选题
Sarah ______ the laundry when Nick stopped by to say hello.
A. was doing B. had done
C. does D. has done
A
B
C
D
【正确答案】
A
【答案解析】
[解析] when之后是描述过去某一时刻正在进行的情况，因此正确的时态应该是过去进行时。
词汇：do the laundry洗衣服/say hello问好，打招呼
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