That scientist argued that his discovery ___the course of history.Achange Bis changing Cwas change把B中的is改为was行不?正在改变着历史进程?

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That scientist argued that his discovery ___the course of history.Achange Bis changing Cwas change
把B中的is改为was行不?正在改变着历史进程?

B, is改为was也是可以的. be+动词ing形式除了表示进行时,也可以表示将来时. his discovery _is changing__the course of history在这里翻译为“他的发现将会改变历史的进程”

应该是was changing, 宾语从句时态要与主句相同