There are some health problems that , when _______ in time , can become bigger o

题干

There are some health problems that , when _______ in time , can become bigger ones later on.

A．not treated	B．not having treated
C．not to be treated	D．not having been treated

上一题下一题 0.64难度单项选择更新时间:2013-10-23 04:17:35

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