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新概念3第一课puma at a large课后的多项选择题中的结构题（新版的是17页）___________________it immediately ran away.a) Observing her b)On being observedc)Having been observed d) On her being observed选什么呢 原因?
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新概念3第一课puma at a large
课后的多项选择题中的结构题（新版的是17页）
___________________it immediately ran away.
a) Observing her b)On being observed
c)Having been observed d) On her being observed
选什么呢 原因?
课后的多项选择题中的结构题（新版的是17页）
___________________it immediately ran away.
a) Observing her b)On being observed
c)Having been observed d) On her being observed
选什么呢 原因?
▼优质解答
答案和解析
选b
意思是一被发现,它就逃跑了
主句也就是it immediately ran away 的主语是it 也就是那个puma ,从句如果要省略主语的话,从句的主语也必须是puma.所以原句应该是
On it was boserved ,it immidiately ran away.而 一...就...的结构选bd,所以只能选b
意思是一被发现,它就逃跑了
主句也就是it immediately ran away 的主语是it 也就是那个puma ,从句如果要省略主语的话,从句的主语也必须是puma.所以原句应该是
On it was boserved ,it immidiately ran away.而 一...就...的结构选bd,所以只能选b
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