I don't know ______ to do it.A.what B.how C.where D.when 选哪个答案,请顺便区分一下四个答案

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I don't know ______ to do it.A.what B.how C.where D.when 选哪个答案,请顺便区分一下四个答案
I don't know ______ to do it.A.what B.how C.where D.when 选哪个答案,请顺便区分一下四个答案

I don't know ______ to do it.A.what B.how C.where D.when 选哪个答案,请顺便区分一下四个答案
答案：BCD
1、这里除了what之外,其余答案都是正确的.
2、what 是疑问代词,在“疑问词+不定式”结构中要充当后面动词的宾语,而后面已经有了宾语it,所以答案A错误.how,where,when 都是疑问副词,在句中作状语.用不同的疑问词,句意就不同.

B
what 是宾语，do what,而此句中有do it ,故不能选A，how to do it表示怎样做

选B
A 用what 不能有“it”
C D 翻译不通 英语不能用汉语方式翻译
希望有帮助

题意为：我不知道怎样做。选B。
如果用what, 只能说 I don't know what to do. 不能加it.
where 和 when 严格来说不算错，但是这两种说法都是针对特殊情况，并不常见。不如how。

选B how to do it 即to do it how , how 是表示某方式
注：
A则what to do，即to do what（没有it）
CD语意上不通

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