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

It was two days before my mother flew to New York I arrived home.
A. when
B. that
C. after
D. since

A. when(答案→)B. thatC. afterD. 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。

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