--- ________ do you help your mother clean the house? --- Once a week.A．How farB
题型：不详难度：来源：
--- ________ do you help your mother clean the house?
--- Once a week.| A．How far | B．How long | C．How soon | D．How often |
|
答案
| D |
解析
| 本题的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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