单项选择题

The ozone layer plays as great a role in the stability of spaceship Earth as ______ the waters of its lakes, ponds, oceans, rivers, and streams.

A．do
B．does
C．play
D．are
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单项选择题
It is most inappropriate ______ in the college VIP lounge.
A．for any students to be there
B．for there to be any students
C．to be any students there
D．to have there any students
单项选择题
______ that the earth was flat
A．Used it to be thought
B．Did it used to be thought
C．Was it used to being thought
D．Does it used to be thought
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