新prep2-170 as新用法？

bryant_yc

170. (29988-!-item-!-188;#058&004661)     (GWD21-Q12)

Birdsknown as honeyguides exhibit a unique pattern of behavior: the bird leadsanother animal, such as a honey-badger or a human, to a bees’ nest withtheir chattering when they fly ahead; after the larger animal takes honey,the bird eats the wax and bee larvae.

A.with their chattering when they fly

B.with chattering and its flying

C.by chattering as it flies

D.by chattering and its flying

E.by chattering as they are flying

答案C.  

对答案没有异议，只是觉得这里as的用法比较特殊... 这里as是表示 “随着，当...时” 吗？

感觉这样的用法在GMAT里还不太多见，有大侠能给出其他类似的例子吗？

ozymendias

as引导的时间状语从句，跟when，while很像，但as强调主句动词和从句动词同时发生
eg：She sang as she went along. （她边走边唱。）