He is sure that there was a flying saucer over there. If he had not seen it himself, he ______it.

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问题 He is sure that there was a flying saucer over there. If he had not seen it himself, he ______it.

选项 A、never have believed
B、never did believe
C、could never believe
D、would never have believed

答案D

解析 本题考查虚拟语气.句意:他确定那边有飞碟飞过, 如果不是他亲眼看见,他是永远都不会相信的。从If引导的从句可知,本题表示与过去事实相反的情况,所以主句要用should/would/might/could+have done的形式.所以答案为D。
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