单项选择题

Hunger could be his only （）for killing a living thing.

A.sensation
B.cause
C.purpose
D.motive

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She worked hard at her task before she felt sure that the results would（）her long effort.

A.justify
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While the development of the suburbs has created problems, it has also provided（） modern housing for millions of people.

A.excessive
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C.memorable
D.substantia