______all  the homework assigned by the school the students have to work at it till midnight
A．CompletingB．To completeC．Having completedD．To have completed
B

試題分析：句意：為了完成學校布置的全部的家庭作業(yè)，學生們不得不學習到了午夜。表示目的，為了……，故用不定式，且與謂語動詞表示的動作沒有時間的先后順序，故用不定式的一般式，選B。
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