单项选择题

Don''t set him to talking philosophy or he''ll go on all evening（）.

A．off
B．on
C．at
D．of

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单项选择题
Just as there are occupations that require college degrees also there are occupations for which technical training is necessary（）.

A．so to there are
B．so too there are
C．so there are
D．so too are there
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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