77. --- Have all the important letters been delivered at the first time? --- I’m sorry. o
77. --- Have all the important letters been delivered at the first time? --- I’m sorry. o
发布时间：2020-08-16 07:01:19
77. --- Have all the important letters been delivered at the first time? --- I’m sorry. only 40% of them. A. It is B. They are C. There are D. It has been
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A. It is B. They are C. There are D. It has been 解析：可联系答.案.网客服索取。