题干
By the time I reached home , my parents ____ the dinner for me already
A：had cooked
B：cooked
C：have cooked
D：cook
答案(点此获取答案解析）
A
By the time I reached home , my parents ____ the dinner for me already
A：had cooked
B：cooked
C：have cooked
D：cook
：“
中至少有一个等于
”
“
”；
：“
”
”，那么