问题补充:
---do you send e-mails to your pen friend? ------Once a month.
A. How long
B. How far
C. How much
D. How often
答案:
A. How long
B. How far
C. How much
(答案→)D. How often
解析:句意:你多久给你的笔友发一封电子邮件?一个月一次。How long多长;How far多远;How much多少(后跟不可数名词);How often 多久。故选D。
考点: 考查疑问词的用法。
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