It was two days before my mother flew to New York I arrived home.
A. when
B. that
C. after
D. since
网友回答
A. when
(答案→)B. that
C. after
D. since
解析：句意：在我妈妈乘飞机去纽约的前两天我到了家。这里使用了强调句，判断是否是强调句的方法是去掉强调句结构，如果这句话成立，就是强调句，这句话去掉强调句结构是I arrived home two days before my mother flew to New York，所以是强调句，选B。