Experts warn that medical waste from hospitals, ifproperly, may contribute to spreading diseases．A．not handledB．not being handledC．not to be handledD．not having -高中英语-n多题

◎ 题干

Experts warn that medical waste from hospitals, if properly, may contribute to spreading diseases．

A．not handled	B．not being handled
C．not to be handled	D．not having been handled

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◎ 解析

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