---_______do you send e-mails to your pen friend?  ------Once a month.
A．How longB．How farC．How muchD．How often
D

試題分析：句意：你多久給你的筆友發(fā)一封電子郵件？一個(gè)月一次。How long多長(zhǎng)；How far多遠(yuǎn)；How much多少（后跟不可數(shù)名詞）；How often 多久。故選D。 
考點(diǎn): 考查疑問詞的用法。
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