While discovering the cause of a serious illness, ______.
A、
the patients should be taken good care of
B、
the effective measures should be taken
C、
the illness should be cured immediately
D、
the doctor should give the patient good care
【正确答案】
D
【答案解析】
由discovering可知，主句的主语应是discover的逻辑主语，发现病因的应当是医生，所以应选D。
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