问题
选择题
It was not until dark ______ he found that it was the correct way to solve the problem. [ ]
A. that
B. what
C. which
D. when
答案
答案：A
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It was not until dark ______ he found that it was the correct way to solve the problem. [ ]
A. that
B. what
C. which
D. when
答案：A