问题
选择题
It was not until midnight that _____ the camping site. [ ]
A. did they reach
B. they had reached
C. had they reach
D. they reached
答案
答案：D
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It was not until midnight that _____ the camping site. [ ]
A. did they reach
B. they had reached
C. had they reach
D. they reached
答案：D
