单项选择题

The air inside a house on office building often has more contaminants（）the heavily polluted air outside.

A．than does
B．as
C．as some that are
D．than that of

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单项选择题
A man escaped from the prison last night. It is a long time（）the guards discovered what had happened.

A．before
B．until
C．since
D．when
单项选择题
The book is（）boring; it is, in fact, rather exciting and fascinating.

A．anything but
B．nothing but
C．no more
D．all but
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