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All communication has to be open, honest, and patient if a happy and healthy relationship _____.

A. will maintain
B. is maintaining
C. are maintained
D. is to be maintained
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科目：高中英語 來源：湖南省模擬題 題型：單選題

All communication has to be open, honest, and patient if a happy and healthy relationship _____.
[     ]
A. will maintain
B. is maintaining
C. are maintained
D. is to be maintained

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