we didn't know____for adviceAto ask whom Bwhom to ask Cwhether ask Dif to ask

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wedidn''tknow____foradviceAtoaskwhomBwhomtoaskCwhetheraskDiftoaskwedidn''tknow____foradviceAtoaskwhomB

we didn't know____for adviceAto ask whom Bwhom to ask Cwhether ask Dif to ask
we didn't know____for advice
Ato ask whom Bwhom to ask Cwhether ask Dif to ask

we didn't know____for adviceAto ask whom Bwhom to ask Cwhether ask Dif to ask
B 因为ask sb,sb 是宾语,所以who变whom(宾语形式)
whom是特殊疑问词,所以提前