摘要：6．His sister left home in 1998.and since. A．had not been heard of B．has not been heard of C．had not heard of D．has not heard of 解析:句意为:他的妹妹在1998年离开家.自从那时就没有音讯了.用现在完成时的 否定结构. 答案:B

网址：http://m.1010jiajiao.com/timu3_id_2560335[举报]