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单选题
5.It worries her a lot her son hasn＇ t contacted her for three days.
A
A. which
B
B. that
C
C. if
D
D. what
答案解析
正确答案：B
解析：
5.［翻译】她儿子三天都没有和她联系了，这使她很担心,【精析】B根据句法习惯，当主语从句较长时可以用形式主语it代替，而把句子真正的主语一主语从句——放在 句末，以达到句子结构的平衡.本句真正的主语是空处引导的主语从句，从句成分和意义完整，所以应用在从句中不 充当语法成分且无词义的that引导。故选B。
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