题目内容：

Mary asked her mother _______ A.when did they go to Singapore B.when would they go to Singapore
C.when will they go to Singapore D.when they would go to Singapore

优质解答

D
宾语从句是陈述语序
其它三个语序都错

追问：

我也选D，可是答案是B诶

追答：

答案只是参考，正确的一定是D