________ the airport,he was arrested by the police.(Unit10-11)A.As soon as arriving?B.Upon he arrived?C.On arriving?D.Upon arrived at为什么选D不选其它?其它选项错在哪里呢?我知道arrive是不及物动词,但是其它选项如果都

________ the airport,he was arrested by the police.(Unit10-11)A.As soon as arriving?B.Upon he arrived?C.On arriving?D.Upon arrived at为什么选D不选其它?其它选项错在哪里呢?我知道arrive是不及物动词,但是其它选项如果都
________ the airport,he was arrested by the police.(Unit10-11)
A.As soon as arriving?B.Upon he arrived?C.On arriving?D.Upon arrived at
为什么选D不选其它?其它选项错在哪里呢?我知道arrive是不及物动词,但是其它选项如果都加上at,会变成可选的吗?请分析一下语法.

________ the airport,he was arrested by the police.(Unit10-11)A.As soon as arriving?B.Upon he arrived?C.On arriving?D.Upon arrived at为什么选D不选其它?其它选项错在哪里呢?我知道arrive是不及物动词,但是其它选项如果都
应该就是at 的问题.
在这题里,
as soon as = upon = on = once,都是说 他一到机场,就.
所以没有区别,而省略的原则是从句省略了主谓.
A as soon as (he is) arriving the airport
B Upon he arrived,
C On （he is） arriving,
如果加了at都是对的