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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单项选择题
Mary has got a full mark in the test. She ______ very hard all these days.
A．will work
B．may work
C．must have worked
D．could have worked
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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