We couldn’t find out

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We couldn’t find out
,so we gave it to the teacher.A.whose pen was it B.whose pen it was C.it was whose pen D.where the pen was是宾语从句么?为什么不选C?
谁能解释下陈述语气为什么不是whose it was pen

对于第一个问题：是宾语从句,因为你可以分析一下句子结构.we是主语,couldn’t find out是谓语,而需要填入的这个部分正是谓语的动作“不能找到”的动作承受者,所以这个部分做宾语.又因为做宾语的部分是一个句子,所以叫做宾语从句 .
对于第二个问题：在宾语从句中,首先要把疑问代词放到句首,然后放被提问的部分,之后按照正常的主谓宾顺序排列,因此选C

But we couldn't find them all We couldn't find them all.变同义句We couldn't find_____of_____. couldn\'t find\'.txt\' she couldn't find her 4.I thought ______of the matter but still couldn't find out i thought of the matter but till couldn't find out the reaso I couldn't find another way ____ the problem A to work out B I tried to repair the car myself but couldn't find out what 1.the doctor___the crying baby ,but he couldn't find out wha It rained heavily yesterday,so we couldn't go out.改同义句以We co We couldn't find the letter yesterday because he _ (hide)it __the problem,we couldn't know how to work it out.__with so