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I think these students should do ______ part in keeping the class-room clean.
A．myB．her
C．theirD．our
C

試題分析：句意：我認為這些學生應該盡他們的職責保持教室干凈。do one’s part盡某人的職責，one’s要跟these students保持一致，故選C。
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