There are some health problems that, when _____ in time, can become bigger ones later on.
| A．not treated | B．not being treated | C．not to be treated | D．not having been treated |
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There are some health problems that, when _____ in time, can become bigger ones later on.
| A．not treated | B．not being treated | C．not to be treated | D．not having been treated |
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