题目内容

(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 complete
C.Having completed D.To have completed
B
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。
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