Every boy and every girl knows that each day and each hour brings their duty.A.

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问题 Every boy and every girl knows that each day and each hour brings their duty.

选项 A. and
B. Knows
C. brings
D. their

答案D

解析their→his/her。用every修饰的名词后面的动词用单数形式,所以也应该把表示复数的their改成his/her。
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