单选题 It's nearly 4 hours' drive from here, ______ we have to start very early if we want to get back before dark.

【正确答案】 A
【答案解析】[考点] 非谓语动词
[解析] 现在分词作定语，补充说明前面的句子。mean意为“意味着”；consider意为“认为，考虑”；think意为“认为，想”；say意为“说”。只有A符合语境。