问题
选择题
_____ I noticed the puzzled look on his face, I realized that he didn't understand me. [ ]
A. Although
B. When
C. Unless
D. Until
答案
答案：B
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_____ I noticed the puzzled look on his face, I realized that he didn't understand me. [ ]
A. Although
B. When
C. Unless
D. Until
答案：B