-- Sir, could you please wait for another 20 minutes and we’ll serve you very soon.
-- Another 20 minutes? It was only 6 o’clock I got here, but it’s 7∶10 now.
A. since
B. when
C. that
D. before
网友回答
A. since
(答案→)B. when
C. that
D. before
解析：考查固定句式。题意：我到这儿的时候才六点钟。it be + 点时间 + when …: 某事发生在某时。注意比较：it be + 介词 + 点时间 + that … 答案为B。