高中英语语法 单选介词After graduation,Frank often thought of those who had helped him ________ his school life.A.of B.across C.at D.through 选C不行的原因是什么.

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高中英语语法 单选介词After graduation,Frank often thought of those who had helped him ________ his school life.A.of B.across C.at D.through 选C不行的原因是什么.

高中英语语法 单选介词After graduation,Frank often thought of those who had helped him ________ his school life.A.of B.across C.at D.through 选C不行的原因是什么.
高中英语语法 单选介词
After graduation,Frank often thought of those who had helped him ________ his school life.
A.of B.across
C.at D.through
选C不行的原因是什么.

高中英语语法 单选介词After graduation,Frank often thought of those who had helped him ________ his school life.A.of B.across C.at D.through 选C不行的原因是什么.
因为at用于时间的时候,是某一个时间点,
但他的学校生活是很长的一段时间.