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_____on his novel.he didn't notice the teacher coming.

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_____on his novel.he didn't notice the teacher coming.
A.Fixed
B.Fixing
为什么答案是a?
he不是动作的发出者吗?那为了前后一致不是应该用b吗?
不要复制来的,我看过,没看懂.
_____on his novel.he didn't notice the teacher coming.
中间应该是逗号
再问: 不好意思打错了,那你能讲解下吗?
再答: 选A 由于他把注意力放在小说上了,所以没注意老师来了.-ed 表原因,与后面的he一致,表被动.如果用to do形式,就是表目的了.如:To fix his attention on his novel ,he used a pen to write on it.他为了把注意力放在小说上,就拿了支钢笔在上面画. 原句若用-ing形式应为;Fixing his attention on the novel,he didn't notice the teacher coming.