Question

【题目】The magic show has been on 20 minutes. It has been on 2.p.m.
A.for, since
B.in, since
C.for, for
D.since, for

Answer 1

【答案】A
【解析】 句意：魔术表演了二十分钟了, 是从下午两点表演的。前句“二十分钟”是时长, 用介词for引出；后句, “下午两点”是时间点, 用since表示自从……。故选A。