“ Although ,” the boy said , “ _______ over and over , the maths problem remaine

题干

“ Although ,” the boy said , “ _______ over and over , the maths problem remained confusing to me ” .

A．explained	B．explain
C．explaining	D．having explained

上一题下一题 0.4难度单项选择更新时间:2012-12-21 08:24:00

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