Susan must ____ quite well on the exam since she seems so confident of passing. ( 章节：3 难度：2)
- A、do
- B、have been doing
- C、be done
- D、have done
正确答案:D
答案解析:有
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Susan must ____ quite well on the exam since she seems so confident of passing. ( 章节：3 难度：2)
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