A、  B、  C、  CTwice a year answers how often. Choice (A)incorrectly answers in the past tense. Choice(B)is not rea

Where are the stamps?
(A)The post office is closed.
(B)The stamps are in the top drawer.
(C)The letter was not stamped.

How often do you take a vacation?
(A)I took one of them.
(B)Four to five times an hour.
(C)I take a vacation twice a year.