Though Einstein was a great scientist many of his ideas______today and are being modified
专四
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Though Einstein was a great scientist, many of his ideas______today and are being modified by the work of todays scientists.
A．are to challenge
B．are challenging
C．may be challenged
D．have been challenged
请帮忙给出正确答案和分析，谢谢！
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正确答案：D
本题综合考查动词的时态和语态。根据题意，尽管爱因斯坦是一位伟大的科学家，他的许多思想现在已经受到挑战并正在被当今的科学家的工作修正着。"思想受到挑战"应该用被动语态，另外并列的谓语arebeingmodified说明"受到挑战"应该在此之前；所以用现在完成时的被动语态。