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        1. 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(yīng)該養(yǎng)寵物,除非你有足夠時(shí)間照顧它。 if如果,unless除非,though盡管,when當(dāng)……時(shí)。養(yǎng)寵物的先決條件是有足夠的時(shí)間照顧它,故選B
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