英语问题,学霸快来帮忙。
Inhissurprise,theheadmasterpraisedhimashelearntfromsometeachersthatJackyusuallyvolunt...
In his surprise,the headmaster praised him as he learnt from some teachers that Jacky usually volunteered to help others.这里的volunteered为什么要加ed?,前面不是有usually吗?
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