The first thing that my brother and _______ did in the early morning was to go out to see the pony.
A、I
B、me
C、mine
D、my
【正确答案】：A
【题目解析】：that my brother and ____ did in the early morning做the first thing的定语从句，that从句后my brother在从句中作主语，and表并列，说明空格该填的也是主格，所以只能是I了。
