【題目】—_______ do I need to feed the pet dog?
—Twice a day.
A.How long
B.How much
C.How soon
D.How often

【答案】D
【解析】how long意為“多長(zhǎng)”,常用來(lái)詢問(wèn)時(shí)間段的長(zhǎng)度;how much意為“多少(錢)”,詢問(wèn)不可數(shù)名詞的數(shù)量或物品的價(jià)格;how soon意為“多久以后”,對(duì)“in+一段時(shí)間”進(jìn)行提問(wèn);how often意為“多久一次”,詢問(wèn)頻率。由答語(yǔ)中的關(guān)鍵信息twice a day(一天兩次)可知問(wèn)句是詢問(wèn)頻率,意為“我需要多久喂一次寵物狗?”故選D。

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