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With his attention on the book he was reading ,he didn't not
题目内容：
With his attention ___ on the book he was reading ,he didn't notice what had happened.
With his attention __ on the book he was reading ,he didn't notice what had happened.
A.focuses
B.focused
C.to focus
D.focusing
为什么?
请详细说明每个选项.
With his attention ___ on the book he was reading ,he didn't notice what had happened.
With his attention __ on the book he was reading ,he didn't notice what had happened.
A.focuses
B.focused
C.to focus
D.focusing
为什么?
请详细说明每个选项.
With his attention __ on the book he was reading ,he didn't notice what had happened.
A.focuses
B.focused
C.to focus
D.focusing
为什么?
请详细说明每个选项.
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