15．Experts warn that medical waste from hospitals，if      properly，may contribute to spreading diseases．（　　）
A．not handledB．not being handled
C．not to be handledD．not having been handled

分析 專家警告說，如果醫(yī)院的醫(yī)療垃圾不能正確的處理，可能會導(dǎo)致疾病的蔓延．

解答 答案A．
If 引導(dǎo)的條件句的主語是 medical waste from hospitals，與handle之間是被動關(guān)系，是"被處理"，B．not being handled 沒有正在被處理；C．not to be handled 不將被處理； D．not having been handled 已經(jīng)沒有被處理．由句意可知是對其實現(xiàn)在的虛擬，而此條件句中由于前面已經(jīng)提到過而省略了主語和系動詞be，因此應(yīng)為not handled，故選A．

點評 考查的是虛擬語氣的用法，主要是根據(jù)省略，得知是對現(xiàn)在的虛擬．

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