I am not a little tired today after giving the room a thorough cleaning and I have never had today.
A. as a tiring day as
B. tiring as a day as
C. as tiring a day as
D. day as a tiring as
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A. as a tiring day as
B. tiring as a day as
(答案→)C. as tiring a day as
D. day as a tiring as
解析：考查as…as…用法。固定搭配as…as…和…一样…；要特别注意该结构中要使用形容词或者副词的原级，而表示比较级；另外形容词所修饰的名词可以直接放在形容词的后面。本题中BD项没有把形容词或者名词放在as…as…中间。A项错在使用副词as修饰名词短语a tiring day。故C正确。