--How often do you go to the library?--. A. In two days B. Every few days C. Each third da

问题补充：

--How often do you go to the library?--.

A. In two days

B. Every few days

C. Each third day

D. Every a few days

答案：

A. In two days

(答案→)B. Every few days

C. Each third day

D. Every a few days

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