It was now clear that no such weapons were manufactured and none been found.

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问题 It was now clear that no such weapons were manufactured and none been found.

选项 A、was found
B、were founded
C、has been found
D、have been founded

答案A

解析 时态应用。 "and"连接的两部分是并列关系,时态应一致,因而排除C、D。found是find的过去式,表“发现”;founded是found的过去式,表“建立,创立”,根据题干意思,本题应选A。
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