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
______ ever so humble, there's no place like home.
A．It be
B．Be it
C．It was
D．Was it
单项选择题
She ______ much more accurate responses now, had she taken more pains in devising the questions.
A．got
B．would have got
C．had got
D．Would be getting
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