问题描述：
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
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
问题解答：
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