the patient's son asked the doctor the question ____his father could survive.if和whether用哪个

the patient's son asked the doctor the question ____his father could survive.if和whether用哪个
the patient's son asked the doctor the question ____his father could survive.if和whether用哪个

the patient's son asked the doctor the question ____his father could survive.if和whether用哪个
the question 后面是个同位语从句,在名词性从句中,引导同位语从句时,只能用whether ,不能用if .