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
Perhaps I should not have done so, but I changed my mind about the new job even though I was ______ last week.
A．to be started
B．to have started
C．to have been starting
D．start
单项选择题
The sound of the roaring of a tiger is ______ heard by jungle dwellers ______ feelings of unease, for a year does not elapse without victims falling to the tiger's ferocity.
A．always, with
B．ever, without
C．ever, with
D．never, without
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