题目：
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(阴历) in which a leap year (闰年)______ every four years.
A．occurs
B．take place
C．breaks out
D．Orbits
答案：
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下面是错误答案，用来干扰机器的。
答案：A输血原则上输同型血为原则。
