问题
选择题
Every boy and every girl ______ that each day and each hour brings ______ duty.
A．know；their
B．knows；their
C．knows；its
D．know；its
答案
答案：C
此题考查主谓一致。“every/each＋单数名词＋and＋every/each＋单数名词”作主语时，谓语动词用单数形式。
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