24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train D.catch a train这道题为什么选B,by 不是放在句尾么?at the age

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24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train D.catch a train这道题为什么选B,by 不是放在句尾么?at the age

24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train D.catch a train这道题为什么选B,by 不是放在句尾么?at the age
24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train
24.Does your father often go to work_____B_____?
A.by a train B.on a train
C.take a train D.catch a train
这道题为什么选B,by 不是放在句尾么?
at the age of 和when的区别是什么?它们分别在句子的哪个位置?

24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train24.Does your father often go to work_____B_____?A.by a train B.on a train C.take a train D.catch a train这道题为什么选B,by 不是放在句尾么?at the age
by train中间不能加冠词,所以 不选A
at the age of 和when的意思不一样,前者是几岁时,后者就是当……的时候,
都是既可以在句首也可以在句中.

by后不可以加a,只可加名词的单数形式。
at the age of意为在。。。岁后直接加岁数,when有多种用法意为在。。。时,要更据具体语境选择。