______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(xué)校布置的全部的家庭作業(yè)，學(xué)生們不得不學(xué)習(xí)到了午夜。表示目的，為了……，故用不定式，且與謂語動(dòng)詞表示的動(dòng)作沒有時(shí)間的先后順序，故用不定式的一般式，選B。
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