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——It was the drug，not the disease，that killed the boy.
——He would be still alive today if he ________ that drug.
A．not takeB．shouldn’t have taken
C．didn’t takeD．hadn’t taken
D
考查虛擬語氣。本題為錯綜條件虛擬語氣。主句與現(xiàn)在事實相反，從句與過去事實相反，故從句用had + done，選D。
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