Engines are to machines ________ hearts are to animals.
A．a(chǎn)sB．thatC．whatD．which
C
此處是固定句型A is to B what C is to D，意為“A對(duì)B之關(guān)系猶如C對(duì)D之關(guān)系”，因此選擇what。
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