问题
选择题
You can't complain of being lonely _____ you don't make any effort to meet people. [ ]
A. until
B. when
C. once
D. though
答案
答案：B
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You can't complain of being lonely _____ you don't make any effort to meet people. [ ]
A. until
B. when
C. once
D. though
答案：B