I sometimes help my mom with her housework____________ Saturdays.
A．a(chǎn)t B．inC．on D．to
C

試題分析：在表示時(shí)間時(shí)，at表示在時(shí)間的一點(diǎn)；on 表示在具體某一天； in表示在一個(gè)時(shí)間范圍，或者接一段時(shí)間，表示多久之后；to表示差幾分到幾點(diǎn)。句意：在周六，我有時(shí)幫助我的母親做家務(wù)。根據(jù)下文Saturdays，可知本句中表示在具體某一天，故用介詞on。選C。
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