问题
选择题
________ the jewels were locked in a strong box，the thieves stole them without any difficulty.
A．If
B．Unless
C．Although
D．Because
答案
答案：C
句意：尽管珠宝被锁在一个结实的箱子里，小偷还是毫不费力地偷走了它们。故此处用Although引导让步状语从句。
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