单项选择题

All mammals have hair, but not always evident.（）

A．but it is not
B．but it is
C．but they are not
D．but they are

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单项选择题
I cannot thank you very much for your kindness, I owe my success to you.（）

A．so
B．too
C．as
D．enough
单项选择题
It was not until she arrived at the classroom she realized she had forgotten her coursebook.（）

A．and she realized
B．which she realized
C．then she realized
D．that she realized
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