Question

---- ________ it is late, I shall go home now.
---- OK, go ________.

A．So; down	B．If; up
C．Since; ahead	D．Because; out

Answer 1

C

试题分析: 句意：因为晚了，我现在要回家了，好的，请先行。So因为down 向下 If;如果up向上
Since既然ahead 提前 Because;因为out出去，根据t is late, I shall go home now.，可知是告别用语，go ahead先行一步，go down下去，go up 上升，go out 出去，根据语境选C。