The thought came to her that maybe she had left the door open when she left home.

The story goes that he failed in the College Entrance Examinations again.

（二）同位语从句前名词的数

同位语从句前的名词通常用单数形式，并且往往带有限定词（word除外）加以修饰。例如：

Where did you get the idea that I could not come?

Give me your promise that you will come to our party this evening.

Word came that China launched its first manned spaceship on October 15, 2003.

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