题目内容
—_______ should we clean the library?
—Twice a week.
—Twice a week.
A.How many | B.How much | C.How long | D.How often |
D
本题回答语表示的是频率,对此提问用how often,故本题选D。
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题目内容
A.How many | B.How much | C.How long | D.How often |