◎ 题干
You can't complain of being left out          you don't make any effort to share your happiness and sorrow
with others.
[     ]
A. when
B. unless
C. once
D. though
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“You can't complain of being left outyou don't make any effort to share your happiness and sorrowwith others.[ ] A. when B. unless C. once D. though…”主要考查了你对  【从属连词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。