当last表持续时提问用什么助动词，还有i generally travel by train 时态对吗？

last用do或者does...它就是一普通的动词...

那个时态对的因为表示一般式...

length-gauge

n.

长度计

length-preserving

adj.

等距的

length-setting

n.

定长

lengthways

['le?kθwe?z]

adj., adv.

纵长的[地]

lengthwise

adv., adj.

纵向, 纵长的

习惯用语

at arm's length

在手臂伸得到的地方; (保持)一定的距 离; 疏远

at full length

极为详细地

全身平伸地; 挺直地

at length

最后, 终于

详细地

挺直地

全身的(指照片、画像)

at some length

相当详尽地

cannot see beyond the length of one's nose

鼠目寸光

draw out to a great length

拖得很久, 持续了很长时间

fall [measure] all one's length

直挺挺地倒下

find [have, get, know, take] the length of sb.'s foot

看出某人的短处; 摸透某人以便加以控制

go (to) all [any] lengths (=go to great lengths)

竭尽全力; 走极端; 什么都做得出

go to the length of (doing)

甚至于, 不惜

go the whole length of it

彻底干, 干到底

keep sb. at arm's length

避免与某人亲近, 对某人敬而远之

measure one's (own) length

全身跌倒在地

not the length of a street

很近的距离; 些微的差别

over [through, throughout] the length and breadth (of)

遍及, 到处

slip sb. a length

[口]惩戒某人, 谴责某人

(男人)与某人发生同性恋关系

work at arm's length

在不利的条件下工作; 干活很吃力

length of (sb.'s) days [life]

某人的寿命