问题补充：
It must have rained last night, the ground is wet now.
A. for
B. because
C. since
D. now that
答案：
(答案→)A. for
B. because
C. since
D. now that
解析：考查连词：句意：昨晚一定下雨了，因为地面现在是湿的。这几个连词都有“因为”的意思，A. for是并列连词，表示推理的理由，B. because表示解释为什么，C. since既然，是说话双方都知道的理由，D. now that既然，是说话双方都知道的理由，选A。
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