单项选择题

There are sixty minutes in ______ hour.

A． an
B． a
C． /
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单项选择题
Do you think maths is ______ than foreign languages
A． as difficult
B． more difficult
C． most difficult
单项选择题
How nice ______ you ______ do that!
A． for...to
B． of...to
C． to...for
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