（2010·重庆模拟）—Alice, you look puzzled．Haven’t you understood it? —Yes．I _____of another problem just n...
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题目内容：
（2010·重庆模拟）—Alice, you look puzzled．Haven’t you
understood it?
—Yes．I
_____of another problem just now．
A．had
thought B．have
thought C．thought
D．was thinking
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