单项选择题

John has never been on time, _______

A． has John
B． hasn't John
C． has he
D． hasn't he
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单项选择题
Our department has a large collection of books, _______are in English.
A． many of which
B． many of them
C． many ones
D． their many
单项选择题
It was not until the accident happened_______.
A． when I realized my carelessness
B． that I realized my carelessness
C． as I realized my carelessness
D． when my carelessness has been realized
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