One day, Thomas Edison came home from school and gave a letter to his mother. He ________ her, My teacher gave this letter to me and asked me to give it to my mother only. His ________ eyes were full of tears as she read ________letter out loud to her child, Your son is a genius . This school is too small ________him and doesnt have enough good teachers to train him. Please teach him ________.
Many years after Edisons mother had died, Edison became one of the ________ inventors of the century. One day, he was going through the old closet and he found a folded letter which ________ to him by his teacher for his mother. He opened it. The message ________ on the letter was, Your son is mentally ill. We cannot let him attend our school any more, he has to leave the school.
红色部分给的答案是 was given，但我感觉过去完成时 had been given 愈加的适合吧。
过去完成时，强调的是过去发生的两件事，哪个先发生，哪个后发生。注意，是为了强调先后顺序才用。不言而喻，假如你并不想强调先后持续，也就不必用过去完成时。
看原文，他发现了一封信，哪种信？写给他的信（不是写给其他人的信，而是写给他的信）。这里只不过强调信是给哪个的，并非强调写信在前，发目前后，所以不需要过去完成时。
语法规则是死的，人是活，对语法规则，要活用，而不是死记。