【題目】—_______ do we brush our teeth at least a day?

—I think at least twice. It’s a good habit.

A.How soonB.How oftenC.How long

【答案】B

【解析】

句意:——我們一天至少要刷幾次牙?——我認(rèn)為至少2次。這是一個(gè)好習(xí)慣。
考查特殊疑問句。How soon提問一般將來時(shí)中的in時(shí)間短語,多久;How often提問頻率,多久一次;How long提問長度和段時(shí)間,多長時(shí)間或長度多少。根據(jù)答句中“at least twice”至少兩次,可知問句是在提問頻率,how often符合題意。故選B

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