单项选择题

It was not until he had arrived home（）he remembered his appointment with the lawyer.

A．that
B．where
C．when
D．which

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You cannot be（）careful when driving a car on the superhighway.

A．very
B．too
C．so
D．enough
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This is one of the most beautiful songs（）I have ever heard.

A．what
B．which
C．that
D．as
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