我要问的问题在下面的句子中:
A moment later Athos, finally overcome by the pain against which he had been struggling, fell to the floor.
问:像what I say/see中say、see都是及物动词,which she buys/chooses中buy、choose也都是及物动词,还有很多例子,我发现动词都是及物的。但struggle是不及物动词,为什么可以用在which he had been后面?谁能帮我指点一下迷津,感谢!