单项选择题

They were surprised that a child should work out the problem ______ they themselves couldn't.

A．once
B．then
C．while
D．if
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单项选择题
Yesterday, Jane walked away from the discussion. Otherwise, she ______ something she would regret later.
A．had said
B．said
C．might say
D．might have said
单项选择题
Many countries are increasing their use of natural gas, wind and other forms of ______.
A．energy
B．source
C．power
D．material
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