单项选择题
A.@setB.@MapC.@ParamD.@value
A.< foreach>B.< if>C.< choose>D.< set>
A.<if test="userName !=null and userName !=’’"></if>B.<if test="userName !=null userName !=’’"></if>C.<if test="userName !=null or userName !=’’"></if>D.<if test="userName !=null \\userName !=’’"></if>
A.< if>B.< update>C.< choose>D.< where>
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