Helen is much more kind to her youngest child than to the others,( ) of course,make the others unhappy. ( 章节：7 难度：3)
- A、who
- B、which
- C、she
- D、that
正确答案:B
答案解析:有
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Helen is much more kind to her youngest child than to the others,( ) of course,make the others unhappy. ( 章节：7 难度：3)
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