问题
选择题
| They didn't discover until they happened to enter the back room ______ someone had stolen the priceless painting. |
A. that B. what C. which D. when |
答案
答案：A
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| They didn't discover until they happened to enter the back room ______ someone had stolen the priceless painting. |
A. that B. what C. which D. when |
答案：A