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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单项选择题
Miss Wang looked at the young man ______.
A．in surprise
B．in surprised
C．at surprise
单项选择题
They kept on ______ me about my family.
A．ask
B．asked
C．asking
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