×
单选题
They had talked only for a few minutes _______they found they were of different opinions.
A
unless
B
while
C
before
D
once
答案解析
正确答案：C
解析：
参考解析:连词辨析。选项中的词均可连接状语从句，但是要根据句意进行选择:他们只交谈了几分钟，就发现双方的观点有分歧。所以主句发生在前，从句发生在后，这一点可以由had talked和found来判断。选项中只有before表示明确的时间先后顺序，其它选项均无此意。A项unless表示"除非"，B项while表示两件事情发生的时间基本一致，D项once通常置于句首，表示"曾经、一旦"。句意:他们只谈论了几分钟就发现双方的观点有分歧。
相关题目
单选题
There is a man at the reception desk who seems very angry and I think he means ________ trouble.
单选题
Evidence came up ________ specific sounds are recognized by babies as young as 6 months old.
单选题
We expected her to ________ her promise.
单选题
l don＇ t think this room will be big enough to_____all the guests.
单选题
_____ you have any questions or needs，please contact the manager after 5:00p.m. on weekdays.
单选题
The policeman stopped the driver and found that he ________ alcohol.
单选题
The students _______ their papers by the end of this month.
单选题
The two brothers look very much _______ .
单选题
The old lady has ______ two wars and revolutions.
单选题
Try not to be absent ________ class again for the rest of the term.
