单项选择题

Adams now maintains that it is less important to save the nation ______ to a perilous future.

A．had alerted them
B．from alerting it
C．as to alert them
D．than to alert it
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单项选择题
Just as too much harmony is tiresome in music ______.
A．the life of too many benefits annoys us
B．so, in life, too many benefits annoy us
C．we are annoyed with lives also of too many benefits
D．much benefits annoy us in life
单项选择题
Economies, several courses of which I have taken thus far, ______ to be difficult but useful for almost all students.
A．prove
B．proves
C．have been proved
D．are proved
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