Whose is this pencil box?I don't.My sisterit is Gina

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Whose is this pencil box?I don't____.My sister____it is Gina's.A、know;thinks.B、 think;knows
C、think；know.D、know；think

选择A

第一个空使用动词原形know（知道）；
第二个空使用第三人称单数形式thinks（认为）

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Whose is this pencil box?I don't____.My sister____it is Gina whose pencil-box is this回答 a,my b,mine c,me d,l 改为复句this is my pencil box 打了很久,不懂别进短文：This is my pencil box.Is i this is my pencil box.改为否定句 This is my pencil-box 改为同义句 is this your pencil? my name is Gina. 划分一下句子成分!谢谢! This is a pencil box.对a pencil box 提问 This is a pencil box.(对” a pencil box”提问 ) This is my family t____. —whose pencil case is this Whose pencil is this?的意思