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234. After the 1911 Revolution, China began to use the Gregorian calendar (solar calendar) and at the same we have also used the lunar calendar(陰歷) in which a leap year (閏年)______ every four years.

234. After the 1911 Revolution, China began to use the Gregorian calendar (solar calendar) and at the same we have also used the lunar calendar(陰歷) in which a leap year (閏年)______ every four years.

A. occurs                   B. take place              C. breaks out              D. Orbits

234. After the 1911 Revolution, China began to use the Gregorian calendar (solar calendar) and at the same we have also used the lunar calendar(陰歷) in which a leap year (閏年)______ every four years.