题目内容
【题目】
A.Once a day.B.Twice a week.C.Once a month.D.Twice a month.
【答案】D
【解析】
【原文】
W: Do you miss your mother, Tom?
M: Of course. I send her an e-mail once a week. I ring her up twice a month.
Q: How often does Tom ring his mother up?
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