问题
选择题
______ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation. [ ]
A. When
B. While
C. Unless
D. Until
答案
答案：B
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______ we can't remove our troubles in life for ever, we can leave them behind when we are on vacation. [ ]
A. When
B. While
C. Unless
D. Until
答案：B