Half of the appie________for your sister．You can't eat it．A.isB.areC.wasD.were
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A解析分析：主语是half of the apple(这半个苹果)，判断half of短语的数，要看of后面的名词，此处the apple是单数(可数名词)，要把整个短语看成是单数。所以选is(由于You can't eat it．说明是现在时间的事情，所以不选一般过去时的was)．(延伸)half of后面也可以接不可数名词，如：Halfof the waterin this bottle is for you．