the doctor ( operate) on five patients since 3 p.m.yesterday 这个空应该如何填啊/

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• the doctor ( operate) on five patients since 3 p.m.yesterday 这个空应该如何填啊/
• the doctor ( operate) on five patients since 3 p.m.yesterday 这个空应该如何填啊/
• The doctor comes to ______ his patients at three every afternoona drop in b call on c call at d look at
• Nothing could have saved him ________ he had been sent to hospital without delay.a.if b.even if c.as if d.unless