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。