not being seen表示没有正在被看.（这是现在进行时态的被动语态）
without being seen 是没有被看到.不是进行时态,being是动名词,因为without是介词,所以用动名词.
从句子时态来看,不是经理正在被看到,是他没有被看到,所以不选A.
After answering a telephone call,the manager entered the roo
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