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。