关于fun 的用法?-Do you enjoy Chinese tea?-Sure.____fun it is to d

关于fun 的用法?
-Do you enjoy Chinese tea?
-Sure.____fun it is to drink a cup of Chinese tea,especially after meals I enjoy that!
A.How B.What C.How a D.What a
答非所问呀。然后帮着说明下。

B.fun是不可数名词
详细：
[fQn]
n.
娱乐,玩笑,嬉笑,有趣的人或事物
vi.
开玩笑
adj.
供娱乐用的
fun
[fQn]
n.
(1)
嬉戏；顽皮
The little dog's full of fun.
这小狗很顽皮.
(2)
娱乐；乐趣
Have fun at the party tonight.
今晚的晚会上玩得很开心.
There's no fun in spending the whole evening playing cards.
整个晚上打朴克牌没有意思.
(3)
玩笑
He's fond of fun.
他喜欢玩笑.
习惯用语
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for fun
当作玩笑；不是认真的 (= for the fun of the thing)
"Mr Alexander doesn't just write for fun; in fact,writing is his bread and butter."
"亚历山大从事写作不是为了好玩,事实上写作是他的谋生之道."
function
[5fQNkF(E)n]
n.
(1)
职责,职能；功能；作用
The function of a chairman is to lead and control meetings.
主席的职责是引导并控制会议.
The function of an adjective is to describe or add to the meaning of a noun.
形容词的作用就是修饰名词.
(2)
庆祝典礼；重大集会
This hall may be hired for weddings and other functions.
这个大厅可租来举行婚礼或其他集会.
(3)
与其他因素有密切关系的事
(4)
函数
In x=5y,x is a function of y.
在 x=5y 中,x 是 y 的函数.
词性变化
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function
vi.
活动；运行；发挥作用
My pen does not function very well.
我的笔书写得不太流利.
The old machine won't function properly if you don't oil it regularly.
那台旧机器如果不经常加油是不能正常运转的.
The machine tool does not function properly.
这台机床有点毛病.
用法词典
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fun
来自中古英语fonne愚蠢,笨拙