To a highly imaginative writer, ______ is a pad of paper and a pen.

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问题 To a highly imaginative writer, ______ is a pad of paper and a pen.

选项 A、all are required
B、all required is
C、all is required
D、all that is required

答案D

解析 根据空当后内容可推断,空当部分为主语。A和C为主谓结构,不能充当主语。B中多了动词is,因此,也可排除。D可充当主语,all后为that引导的定语从句,因此D为正确选择。
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