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When a pencil is partly in a glass of water , it looks as if it__________ .
A. breaks    B, has broken     C. were broken   D. had broken

C

解析试题分析: as if引导的从句如果表示的是虚假的事情,则常用虚拟语气.表示现在用一般过去时,如果是动词be,无论主语是单数还是复数一律用were.表示过去用过去完成时;表示将来用过去将来时.句意:当一支铅笔的一部分放在水杯里,看起来好像铅笔是断的。根据句意可知实际上铅笔并没有断。这是一个虚假的事情,且这是一个与现在事实相反的虚拟语气,故使用were。故C正确。
考点:考查虚拟语气

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