Trắc nghiệm: The doctors know that it is very difficult to save the patient's life. _______ they will try their best,The doctors know that it is very difficult to save the patient's life. _______ they will try their best.

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The doctors know that it is very difficult to save the patient's life. _______ they will try their best, The doctors know that it is very difficult to save the patient's life. _______ they will try their best.

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