They [success]developed a new kind of medicine to cure the disease

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• All the doctor are trying ______ a new kind of medicine to cure the patient.
• 51页17.The doctors are trying ----a new kind of medicine to cure the patient A.using B.to use C.use 理由
• They [success]developed a new kind of medicine to cure the disease
• They [success]developed a new kind of medicine to cure the disease
• All the doctor are trying ______ a new kind of medicine to cure the patient.A.using B.to use C.to using D.usedtry to do是设法、尽力做某事,try doing是试着做某事,我觉得两个都通啊……答案是A,请问为什么呢?
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