A. while
B. until
C. when
D. before
[解析]句意:——我想知道你要收多少服务费。——前两次是免费的,但第三次的费用是30美元。while 然而;until 直到;when 当……时候;before 在……之前,才,就。
[答案]A
模拟精选
1.(2017·江苏栟茶中学调研)I warned him of the slippery road, but he fell on fours ________ I finished my words.
A.as
B.before
C.until
D.since
[解析]before 引出时间状语从句,意为“不等……就……”。
[答案]B
2.(2017·海淀区期中)The boy was so tired that he fell asleep ________ his mother could take off his clothes.
A.before
B.after
C.while
D.when
[解析]before 引出时间状语从句,意为“不等……就……”。
[答案]A
3.(2017·河南洛阳市期中考试)They had no sooner arrived at the airport ________ it was time to check in.
A.when
B.before
C.than
D.though
[解析]had no sooner done...than... 一……就……,为固定句型。
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