scientists are trying to develope a special material,__ they will make use of in spacecraft a it bscientists are trying to develope a special material,__ they will make use of in spacecrafta it b one c that d what

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scientists are trying to develope a special material,__ they will make use of in spacecraft a it bscientists are trying to develope a special material,__ they will make use of in spacecrafta it b one c that d what

scientists are trying to develope a special material,__ they will make use of in spacecraft a it bscientists are trying to develope a special material,__ they will make use of in spacecrafta it b one c that d what
scientists are trying to develope a special material,__ they will make use of in spacecraft a it b
scientists are trying to develope a special material,__ they will make use of in spacecraft
a it b one c that d what

scientists are trying to develope a special material,__ they will make use of in spacecraft a it bscientists are trying to develope a special material,__ they will make use of in spacecrafta it b one c that d what
B
A显然不对 句意不通
B指代material 做make use of的宾语 做宾语的先行词引导词that可省略
C没有先行词 而且that是不可以引导非限制性定语从句的(一般就是两个分句 指用逗号隔开的后面半句)它只能引导限制性定从
D的what=the sth that 这里就相当于the meterial that 与前半句重复 要改用which就可以成立
其实 我觉得 D选项放在这边很难解释 但是which是成立的 what相对于which 我认为就一定是不成立的 而且我也说了与前面半句重复 句式太啰嗦了 你不确定的话 可以再问别人

C that 定语从句,

C
定语从句,从句缺宾语
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看了 濑田の小白 的,我也选B。可以用which,不能用that。用one的话是同位语,连接词that省略

选c