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 handledD. not having been handled

 

A

【解析】

試題分析：根據(jù)句意：醫(yī)療垃圾如果不正確處理，將會傳播疾病。這里其實(shí)是if 從句的省略形式。It it was not handled properly, 當(dāng)主從句的主語一致的時候，可以省略從句的主語和be動詞，被動語態(tài)省略了系動詞和主語就是過去分詞的形式。所以選A。

考點(diǎn): 考查省略句

 

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