The doctor is giving a mouth-to-mouth b_____ to the patient.

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• The doctor is giving a mouth-to-mouth b_____ to the patient.
• The doctor is giving a mouth-to-mouth b_____ to the patient.
• The doctor did his best to s_____ the patient
• 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?