Question

        , the disease will produce a powder poison that will kill the patient.

A．If it untreated	B．If is untreated
C．If being untreated	D．If untreated

Answer 1

D

试题分析：句意：如果不得到治疗，这种疾病将会产生杀死病人的粉末状病毒。完整形式为：If the disease diphtheria is untreated…，从句的主语与be动词省略了，选D。