(),it immediately ran away.A.on being observed B.having been observed这个为什么选A 我觉得B比较对.新概念第三册的第一篇

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(),it immediately ran away.A.on being observed B.having been observed这个为什么选A 我觉得B比较对.新概念第三册的第一篇
(),it immediately ran away.A.on being observed B.having been observed
这个为什么选A 我觉得B比较对.新概念第三册的第一篇

(),it immediately ran away.A.on being observed B.having been observed这个为什么选A 我觉得B比较对.新概念第三册的第一篇
On been observed有正在,刚好被察觉之意,having been更侧重于已经被察觉了.如果是已经被察觉了,它还有逃跑的必要吗.应该是一被察觉立马逃跑.这道题主要还是看语感的,多读多悟几遍,很容易理解A了