The boy is Bill _ monitor of class one A a B an C the D /____of the Grade ____ students have taken part in this activityA Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth D Tow-fifths ; Fourth

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The boy is Bill _ monitor of class one A a B an C the D /____of the Grade ____ students have taken part in this activityA Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth D Tow-fifths ; Fourth

The boy is Bill _ monitor of class one A a B an C the D /____of the Grade ____ students have taken part in this activityA Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth D Tow-fifths ; Fourth
The boy is Bill _ monitor of class one
A a B an C the D /
____of the Grade ____ students have taken part in this activity
A Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth
D Tow-fifths ; Fourth

The boy is Bill _ monitor of class one A a B an C the D /____of the Grade ____ students have taken part in this activityA Two-fifth ; Four B Two-fifths ; four C Second-five ; Fourth D Tow-fifths ; Fourth
前面已有"the"所以就不可以重复"the".
"the"的意思在句中是一致的.
加上了它就会显得重复,累赘.
并且,"monitor"前不缺主语,它是连接着"bill"而言的.

第一题:C 这个男孩是比尔,一班的班长。the定冠词,此处特指他是一班的班长。
第二题:B 有两个知识点:分数的表达法,分子用基数词,分母用序数词,当分子大于2(包括2),视为复数。在分母后加s. 四年级的英语表达法为 Grade Four

表示特定职位时要用the(再例:president)
几分之分当分子大于等于2时分母要加s,而四年级的表达就是Grade Four

c,b