请问这题怎么做?求答案,感谢!
选填括号中的词。YouhaveprobablyheardofMother'sday,whichisaholiday(that/when)fallsonthesecondS...
选填括号中的词。You have probably heard of Mother's day , which is a holiday (that/when) falls on the second Sunday of May here in Hong Kong .
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