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  3. Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another plan

Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another plan

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问题 Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet.
选项 A、have been
B、are
C、had been
D、were
答案A
解析 用现在完成时，recorded reports为复数，所以用have been。
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