Thousands of trees must _______ every year.
| Thousands of trees must _______ every year. |
| [ ] |
| A. plant B. be planted C. have been planted D. have planted |
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1年前3个回答
你能帮帮他们吗
| Thousands of trees must _______ every year. |
| [ ] |
| A. plant B. be planted C. have been planted D. have planted |
1年前3个回答
你能帮帮他们吗