1.As we know knowledge is ____ so we must study hard to try
2个回答

1.power ; powerful

power是名词 意为力量,知识就是力量,powerful是形容词,意为有力量的,powered也是形容词,但意为有动力装置的；以…为动力的 放在这里不通

2.do have

have to do sth.不得不去做某事 否定：don't/doesn't have to do sth.

3.so that

我们正好刚学到这个,so that 肯定句与enought to转换,否定句与not enought to 或 too...to 转换.

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