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I didnt know

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I don't know when the letter------- A will receive B will be received C would receive D would be received
I didnt know
解题思路: 如下
解题过程:
选B。
这是一个宾语从句,主句的时态是一般现在时,所以从句的时态范畴不能是过去时,所以首先排除C和D。
根据句意可知,宾语从句的主语letter与动词receive之间是被动关系,所以要用被动语态,所以选B是正确的。
最终答案:略