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In his book,he explains both ______ it means to be a scientist and ______ science works.
A.how; howB.what; that
C.what; howD.how; that
C
考查名词性从句。句意:在他的书里,他即解释了科学家的意义又说明了科学是如何的运作的。前空为意味作----,what的含义;后空work为不及物动词,故用how.
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