英语语法问题
1.Thechoiceastowhichfacttouseisbasedonatheory.fact是被use,为什么不用tobeused,类似的见过好几次了,是和use...
1.The choice as to which fact to use is based on a theory.
fact是被use,为什么不用to be used,类似的见过好几次了,是和use这个动词有关嘛?
2.This is one of his stock jokes. I have heard it many times.
完成时后面的时间状态多加for,那这里为什么不用for many times?是可以省略嘛? 展开
fact是被use,为什么不用to be used,类似的见过好几次了,是和use这个动词有关嘛?
2.This is one of his stock jokes. I have heard it many times.
完成时后面的时间状态多加for,那这里为什么不用for many times?是可以省略嘛? 展开
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