单选题 As a seaman John often goes to sea, and the days when he is at home with his parents in a year ______ about one month.

【正确答案】 A

【答案解析】A．合计达……；B．添加；C．增加。没有add for这个短语。原句意思是：作为一名海员，约翰经常出海，一年中他和父母在一起的日子总共大约一个月。