It was two days before my mother flew to New York I arrived home.A. whenB. thatC. afterD.

问题补充：

It was two days before my mother flew to New York I arrived home.

A. when

B. that

C. after

D. since

答案：

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。