Every boy and every girl ______ that each day and each hour brings ______ duty.
A．know；theirB．knows；theirC．knows；itsD．know；its
C
此題考查主謂一致�！癳very/each＋單數(shù)名詞＋and＋every/each＋單數(shù)名詞”作主語時(shí)，謂語動(dòng)詞用單數(shù)形式。
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