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)_做题室

单项选择题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：
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