【题目】I ______ a letter once a week to my family when I was in my first college year.
A.write
B.was writing
C.have written
D.wrote

【答案】D
【解析】句意：上大学一年级的时候，我每周都会给家人写一封信。根据所给动词was可知表示过去某个时间发生的事，用一般过去时。故选D.