问题
选择题
I was doing some shopping in the supermarket ________ it suddenly occurred to me that I'd left
my wallet at home.[ ]
A. when
B. while
C. until
D. before
答案
答案：A
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I was doing some shopping in the supermarket ________ it suddenly occurred to me that I'd left
my wallet at home.[ ]
A. when
B. while
C. until
D. before
答案：A