Li Lei works in England . He comes to China__.
A. three time a year
B.three times a year
C. three times year
B

試題分析：根據(jù)three可知time應(yīng)用復數(shù)，故排除A；根據(jù)year是單數(shù)，其前面應(yīng)該用a，表示一年，故排除C。本句的意思是“他三年來一次中國。”所以本題選B。
點評：表示頻率的短語的表達法，一般是“次數(shù)+ 一段時間”。另外，還有一些詞也是頻率副詞，如sometimes、often、never、usually等。提問頻率用how often。
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