问题
选择题
| They went on well at first but eventually everything ______ they had worried about happened. |
A. which B. what C. that D. when |
答案
答案：C
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| They went on well at first but eventually everything ______ they had worried about happened. |
A. which B. what C. that D. when |
答案：C
平面的构成是由（）。