With all my attention ____ my homework,i didn't even notice my father standing by me.a.fixed on b.fixing on答案选a,但不是有 with time going by= as time goes by 吗?这两个问题不是类似的吗? (满意追加财富悬赏)

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With all my attention ____ my homework,i didn't even notice my father standing by me.a.fixed on  b.fixing on答案选a,但不是有 with time going by= as time goes by 吗?这两个问题不是类似的吗?  (满意追加财富悬赏)

With all my attention ____ my homework,i didn't even notice my father standing by me.a.fixed on b.fixing on答案选a,但不是有 with time going by= as time goes by 吗?这两个问题不是类似的吗? (满意追加财富悬赏)
With all my attention ____ my homework,i didn't even notice my father standing by me.
a.fixed on b.fixing on
答案选a,但不是有 with time going by= as time goes by 吗?这两个问题不是类似的吗? (满意追加财富悬赏)

With all my attention ____ my homework,i didn't even notice my father standing by me.a.fixed on b.fixing on答案选a,但不是有 with time going by= as time goes by 吗?这两个问题不是类似的吗? (满意追加财富悬赏)
这个地方考察的是动词的活用.
动词活用分
动名词,动词ing,2个意思,1个表示现在进行,1个表示主动
动词分词,2个意思,1个表示过去,1个表示被动
动词不定式,2个意思,1个表示将来,1个表示目的.
这个题目中,注意力的主语是人,他是被使用的..所以要用fixed on.
With time going by,这个就是动名词了,表示主动,时间是自己走.
as time goes by,这是一个句子,as 引导的时间状语从句,跟上面动词活用不一样的.