专升本考试

【单选题】 Throughout the past few centuries there ______ recorded reports of space vehicles which have visited our earth from another planet.
A．have been
B．are
C．had been
D．were

网考网参考答案：A
网考网解析：
用现在完成时，recorded reports为复数，所以用have been。 查看试题解析出处>>