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

試題分析: 句意：你不應該養(yǎng)寵物，除非你有足夠時間照顧它。 if如果，unless除非，though盡管，when當……時。養(yǎng)寵物的先決條件是有足夠的時間照顧它，故選B
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