【題目】It’s bad for your eyes if you keep them ______ on the screen for a long time．

A． fixed B． fix

C． fixing D． having fixed

【答案】A

【解析】分析句子，可知空格內(nèi)的詞在句子中作賓語補足語，用于修飾賓語them;又由于them指代的是eyes，與fix之間是被動關(guān)系，故用過去分詞。根據(jù)句意，可知選A。句意：如果你的眼睛一直長時間都專注在屏幕上，這對你的眼睛有害。

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