单项选择题

Here are some ______ inventions and this is ______ one of them.

A． more useful, more useful
B． useful, the most useful
C． the most useful, a useful
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The man has found a room______.
A． to live
B． to live in
C． living in
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Neither of you ______ an office worker.
A． are
B． were
C． is
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