问题
选择题
You can't complain of being left alone ________ you don't make any effort to meet people.[ ]
A. when
B. while
C. though
D. unless
答案
答案：A
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You can't complain of being left alone ________ you don't make any effort to meet people.[ ]
A. when
B. while
C. though
D. unless
答案：A