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do you know (what,how) he will choose a present for his mother's birthday?答案给的是how为什么?

题目详情
do you know (what,how) he will choose a present for his mother's birthday?
答案给的是how
为什么?
▼优质解答
答案和解析
a present是宾语!hell choose a present...这已经是个完整的句子了!只有在名词性的从句词组里缺少成分才能用what来代替成分!
就这样!