－      does your father go to see your grandmother ?
－ Once a month .
A. How long .          B. How soon          C. How often.
C
“how long ”意思是“多長(zhǎng)時(shí)間”，對(duì)for+一段時(shí)間提問(wèn)，“how soon”意思是“要多久”，對(duì)in+一段時(shí)間提問(wèn)，“how often”意思是“多久一次”。答語(yǔ)是一月一次，故C 。
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