题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：选择“设备名称”和“销售额”两列的内容(总计行除外)，单击数据菜单下的数据透视表和数据透视图，单击下一步，下一步，完成，设置X轴为设备名称，标题为“没备销售情况图”，取消显示图例，设置网格线...
