it is to go for a picnic on such a day!前面填什么A.what a fun B.what fun C.how funny D.how a fun -Do you think it's a good idea...

______ it is to go for a hike in such lovely weather! A\uff0eHow fun B\uff0eHow funny C\uff0eWhat fun D

C \u8bd5\u9898\u5206\u6790\uff1a\u8003\u67e5\u611f\u53f9\u53e5\uff1ahow\u4e0ewhat \u90fd\u53ef\u4ee5\u5f15\u5bfc\u611f\u53f9\u53e5\uff0c\u4f46\u662fhow \u540e\u9762\u63a5\u7684\u662f\u5f62\u5bb9\u8bcd\u3002what\u540e\u9762\u63a5\u7684\u662f\u540d\u8bcd\u3002fun\u5728\u8fd9\u91cc\u662f\u4e2a\u540d\u8bcd\uff0c\u800cfun\u4f5c\u540d\u8bcd\u65f6\u662f\u4e2a\u4e0d\u53ef\u6570\u540d\u8bcd\uff0c\u6240\u4ee5\u5c31\u6210\u4e86what fun \u4e86\uff0c\u53e5\u610f\uff1a\u8fd9\u4e48\u597d\u7684\u5929\u6c14\u51fa\u53bb\u8fdc\u8db3\u771f\u662f\u6709\u8da3\u7684\u4e8b\u60c5\u3002\u9009C\u3002

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http://support1.lenovo.com.cn/lenovo/wsi/modules/serviceclient.aspx?intcmp=LXFW_Client_homepage_icon
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Idea\u8bba\u575b\uff1ahttp://lenovobbs.lenovo.com.cn/forum.php?intcmp=FM_LBBS_baidureply
Think\u8bba\u575b\uff1ahttp://thinkbbs.lenovo.com.cn/forum.php?intcmp=FM_LBBS_baidureply
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B what fun
what 跟名词,how 修饰形容词或副词
What fun it is!它是多有趣的事啊！fun 是名词，不可数，翻译为有趣的事。How funny it is!它是多么滑稽啊！funny是形容词，翻译为滑稽，常带贬义。

选B，what fun
fun是不可数名词，在正常语序中应表达为 It is fun to go for a picnic on such a day.
而这里what在句首并不是表示疑问句，而是感叹句。因为感叹的是fun，且是名词，所以用what放在句首。

扩展阅读：just do it ... keep at it ... take it easy ... pay it forward ... it is my pleasure ... there is no game ... there is doing todo ... you are welcome ... go a head ...