题目内容：
WhichofthefollowingisNOTmentionedsomeyearsagohowthechildrencelebratetheHalloween? A．Dressingupinthebestholidayclothes.
B．Ringingdoorbells.
C．Throwingbitsofcornonthewindowpanes.
D．Dressingupinstrangeandfrighteningcostumesandplayingtricksonone'sneighborsfriends.
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答案解析：