The patient's son asked the doctor the question ________ his father could survive the big operation.
whether　
考查同位語從句。在此同位語從句表示一種不確定的狀態(tài)，故用whether引導(dǎo)同位語從句，表示the question的具體內(nèi)容。if一般不用來引導(dǎo)同位語從句。
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