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22.Happy times usually pass quickly without _______.

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22.Happy times usually pass quickly without _______.
A.noticing B.being noticed C.having noticed D.to be noticed
此题考你两个语法点:
【1】介词without,其后加动词的现在分词,即-ing形式,是故,排除D选项;
【2】被动语态,此句逻辑主语为happy times 美好的时光,应该是不被注意地流逝,be noticed,结合【1】,可知答案是【without being noticed】.
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