单项选择题

______ one of the subjects that appeal to many university students.

A．Economics is
B．Economice is
C．Economics are
D．Economics have been
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单项选择题
The speaker, ______ for her splendid speeches, was warmly received by the audience.
A．having known
B．being known
C．knowing
D．known
单项选择题
This study proves that there is no life on Mars. But ______ man still ______ there is.
A．a great deal... think
B．a great many... think
C．much... thinks
D．many a... thinks
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