My brother stayed in Hong Kong f

My brother stayed in Hong Kong for five months, during which time l often wrote him letters.
A、我哥哥在香港呆了五个月，期间我经常给他写信。
B、我经常给他写信，在我哥哥呆在香港的五个月里，。
C、我哥哥在香港呆的五个月里我经常给他写信。
D、我哥哥经常收到我写的信在香港呆的五个月里。
【正确答案】：A
【题目解析】：p99