she has to be in bed by ten.（对划线部分提问）答案是when does she have to be in bed我这么写行吗?what time does she have to be in bed

she has to be in bed by ten.（对划线部分提问）答案是when does she have to be in bed我这么写行吗?what time does she have to be in bed
she has to be in bed by ten.（对划线部分提问）答案是when does she have to be in bed我这么写行吗?
what time does she have to be in bed

she has to be in bed by ten.（对划线部分提问）答案是when does she have to be in bed我这么写行吗?what time does she have to be in bed
不行.因为what time 只能表示一个具体的时间点.
而原句中的by ten 是“十点之前”,是一个时间段,非时间点,故不能用what time 提问,必须用when.

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你好,这题的正确答案是:
How long does she have to be in bed?
因为这里的by ten.表示的是一个持续时间,所以疑问词不能用when.
整个句子的意思是:
她不得不在床上呆多久呢?

不行。因为what time 只能表示一个具体的时间点。
而原句中的by ten 是“十点之前”，是一个时间段，非时间点，故不能用what time 提问，必须用when。

学习是一件愉快的事！ (*^__^*)
请及时采纳，多谢！