问题
选择题
| The highway through the rain forest was completed in 1990, _____ some animal species have died off. |
| A. by when B. since then C. since when D. by which time |
答案
答案：C
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| The highway through the rain forest was completed in 1990, _____ some animal species have died off. |
| A. by when B. since then C. since when D. by which time |
答案：C