He is sure that there was a flying saucer over there. If he hadn't seen it himself, he ____ it. ( 章节：2 难度：2)
- A、never have believed
- B、never did believe
- C、could never believe
- D、would never have believed
正确答案:D
答案解析:有
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He is sure that there was a flying saucer over there. If he hadn't seen it himself, he ____ it. ( 章节：2 难度：2)
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