___ medicine works in a human ……

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___ medicine works in a human ……
___ medicine works in a human body is a question___not everyone can understand fully.
a.how,what
b.that which
c.that what
d.what that

a,全句翻译--药物如何在人体起作用的是一个并非所有人都能完全理解的问题,之前是一个主语从句,不缺成分,但语意不完整,how“如何,怎样”在此引导主语从句,第二个空是一个what 引导的同位语从句,由于从句中缺理解的宾语,
再问： sorry A,打错了，是how,that 帮忙解释下~谢啦！！！
再答：我也觉得答案应该是that或which，第二个空是定语从句修饰question，that或which在从句中指代question，做宾语，也可以省略，这回可以吗
再问：第一空，你说的“之前”是指哪个呢？还有，1.不缺成分，语义完整应填什么？ 2.缺成分，语义完整应填什么呢？谢啦，这块我学的不太好呢。。。~

___ medicine works in a human …… 1、( ) medicine works in a human body is a question ( ) not e 1.（How ） medicine works in a human body is a question（that ） Her sister works in that hospital ___ a nurse The woman works in a ___ factory. 英语选择题 Human recourses works well in theory but not in practice Paul works in a power plant.It ___ two months since he ___ a The medicine tastes ________ , but works ________. A．bitter; The farmer works ___ the farm ___ Sunday morning.A.in;on B.o 填空：this is ___studies hard my father is a ___.he works in a Mr.White works as a journalist at present,but he ___ in a hi ___ human problems that repeat themselves in ___ life repeat