A、  B、  C、  C Twice a year answers how often. Choice (A) incorrectly answers in the past tense. Choice (B) is n

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.