单项选择题

______ that the formation of the sun, the planets, and other stars began with the condensation of an interstellar gas cloud.

A．It is believed
B．Believing
C．Being believed
D．To believe
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单项选择题
The reporters exposed the corruption of several senior officers in the government; consequently, these officers _________ to resign from office.
A．have asked
B．were asked
C．had asked
D．had been asked
单项选择题
Where does the self-guided tour start
A．In the Science Building.
B．In the Student Center Building.
C．In the University Recreation Center.
D．In the University.
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