(2013·成都一模) all the homework assigned by the school, the students have to work at it till midnight.
A. Completing
B. To plete
C. Having pleted
D. To have pleted
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A. Completing
(答案→)B. To plete
C. Having pleted
D. To have pleted
解析：选B 考查非谓语动词。此处为目的状语， 因此使用不定式，排除A和C，而且不强调完成，因此使用不定式的一般式，故选B。