问题描述：
| They haven't seen each other for ten years, but they still keep in _____ contact with each other. |
| [ ] |
| A. constant B. instant C. content D. consistent |
考点提示：形容词
最佳答案：
| A |
最佳答案：
题目：They haven't seen each other for ten years, but they still keep in _____ contact with each
最佳答案：
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