Engines are to machines ______ hearts are to animals.A、thatB、whichC、whenD、wha

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问题 Engines are to machines ______ hearts are to animals.

选项 A、that
B、which
C、when
D、what

答案 D

解析考查方式状语从句。这是固定句型，用来指what前后两句话有着相类似的内在联系，即“A对B就如A1对B1”，因此选D。此句型中的what也可以用as。

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