问题描述：
四级完形填空题
when we receive something that we want ,or somrthing happens ( ) we like,we usually feel joy or hapiness.
A:if b:what c:that d:when
请说明理由,并辨析ABCD
when we receive something that we want ,or somrthing happens ( ) we like,we usually feel joy or hapiness.
A:if b:what c:that d:when
请说明理由,并辨析ABCD
问题解答：
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