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—_________do you write to your parents?

—Once a month.

—______do you write to your parents?
-- Twice a month.

—______ do you write to your parents?   —Every day.

   A. How long          B. How soon         C. How often        D. How far

—______do you write to your parents?

-- Twice a month.

A．How often                             B．How many

C．How long                              D．How soon