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

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问题  
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.

选项 A、 
B、 
C、 

答案C

解析 Twice a year answers how often. Choice (A)incorrectly answers in the past tense. Choice(B)is not realistic.
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