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
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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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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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