题目内容

You shouldn’t keep a pet _______________ you have enough time to care for it.
A．ifB．unlessC．thoughD．when
B

试题分析: 句意：你不应该养宠物，除非你有足够时间照顾它。 if如果，unless除非，though尽管，when当……时。养宠物的先决条件是有足够的时间照顾它，故选B
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