Question

Great as Einstein was,many of his ideas___today a

Great as Einstein was,many of his ideas___today and are being modified by the work of scientists of our time. A.are to be challenged B.may be challenged C.have been challenged D.are challenging 答案是B.....C哪里错了?

Answer 1

C 意思是已经持续被挑战，B 意思是 可能被挑战。所以正确答案是B，因为并不是所有爱因斯坦的理论发明都已经被挑战过。