问题
选择题
| This is _____ each year a great number of people from all over the world try to immigrate to California. |
A. when B. what C. why D. that |
答案
答案：C
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| This is _____ each year a great number of people from all over the world try to immigrate to California. |
A. when B. what C. why D. that |
答案：C