No sooner had we reached top of the hill ____ we all sat down to rest.
A、when
B、then
C、than
D、until
【正确答案】：C
【题目解析】：本题考察固定搭配：No sooner... than 一...就...，这句话的意思是：我们一到达山顶就坐下休息，故选C。
No sooner had we reached top of the hill ____ we all sat down to
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