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The astronaut did many experiments in the spaceship,___ much

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The astronaut did many experiments in the spaceship,___ much help for knowing space.
A which we think is B I think which is of C of which we think is D which we think are of 为啥?A不对
When the spaceship traveled above a new-looking earth appeared before us,____that_we had never seen before
Aone B the one (为什么)
The astronaut did many experiments in the spaceship,___ much
答案是D.因为be of help就相当于helpful.而A中的is用错了,因为which指的是experiments,是复数,所以is用单数,明显错了.
再问: When the spaceship traveled above ,a new-looking earth appeared before us,____that_we had never seen before Aone B the one (A为什么)
再答: 选B. one表示 earth. 你可以把earth代回A答案中,句子明显是不通顺的。
再问: 这题one好象是=the one 答案是A呀?
再答: one 和the one是不同的,一个有定冠词,一个没定冠词。有定冠词的表示特指某样东西,没定冠词的是泛指。在这个句子中,One是特指earth的,所以要有定冠词,选B才对!