____ the essay a second time, the hidden meaning will become clearer to you.
A. While reading
B. After reading
C. If reading
D. When you read
【参考答案】选D。
如果非谓语动词reading做状语，其逻辑主语是句中主语the hidden meaning。然而The hidden meaning不能执行read的动作，所以排除ABC。
【语法链接】状语从句中，当主句和从句的主语一致时，从句可以 省略主语，动词用相应的分词形式。
e.g.
1.When the students saw the teacher entering the classroom, they stood up.
=When seeing the teacher entering the classroom, they stood up.(主句和从句的主语都是they, 从句以省略主语，动词用分词seeing，表示学生们看见)
2.When he was asked by the teacher, he answered politely.
=When asked by the teacher, he answered politely.(主句和从句的主语都是he, 从句以省略主语，动词用分词asked)
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