题目内容
5．It's getting dark，_________ we'd better leave now．（ ）| A． | but | B． | because | C． | so | D． | or |
分析 天要黑了，所以我们最好现在离开．
解答 答案：C
because因为，表原因；but但是，表转折；so因此，表结果；or或者，表选择；前面的"天要黑"导致了后面"我们最好现在离开"的结果，故选C．
点评 本题考查连词辨析，先弄清所给词的词义及用法，再根据情境选择正确答案．
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