关于V-ing 和 Who 修饰人时的区别

lohan1229 · 发表于 2016-7-30 15:04:09

题目是这样的
The possible long-term health risks to airline personnel who repeatedly cross multiple time zones has been a concern since the first jet transports went into service in the 1950s.

A)who repeatedly cross multiple time zones has been a concern since the first jet transports went
B)who are repeatedly crossing multiple time zones has been a concern since the first jet transports that went
C)who repeatedly cross multiple time zones have been a concern since the first jet transports went.
D)repeatedly crossing multiple time zones has been a concern since the first jet transports went
E)repeatedly crossing multiple time zones have been a concern since the first jet transports going

我知道选项C是完全没有歧义的，但是选项D中的repeatedly crossing.....这样修饰airline personnel是会引起歧义的嘛？
以及V-ing什么时候修饰人/物是没有问题的呢？谢谢了

[SC悬赏令] 关于V-ing 和 Who 修饰人时的区别

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