will your head teacher return from the USA?---In two days.A. How longB. How soonC. How

问题补充：

--- will your head teacher return from the USA?

---In two days.

A. How long

B. How soon

C. How often

D. How old

答案：

A. How long

(答案→)B. How soon

C. How often

D. How old

解析：此题答案错误，短语辨析。How long 多长时间，How soon 多久，表示将来How often 表示频率，多久一次，How old 多大，in +时间表示将来，常用来回答以how soon提问的特殊疑问句。所以选B。