问题
选择题
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
答案
答案：A
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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
答案：A