—do you write to your parents?-- Twice a month.A. How oftenB. How manyC. How longD. How so

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(答案→)A. How often
B. How many
C. How long
D. How soon
解析：句意：你多久给你的爸爸妈妈写一次信？一个月写两次。How many多少，与可数名词连用；How often 多久一次，How long多长时间，How soon多久，表将来。