单项选择题

Some members of the committee suggested that the meeting（）.

A.being postponed
B.to be postponed
C.postponed
D.be postponed

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（）no gravity,there would be no air around the earth,hence no life.

A.If there was
B.If there had been
C.Were there
D.Had there been
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Making energy use completely harmless to the environment（）very difficult and usually economically expensive.

A.are
B.is
C.have been
D.shall be
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