________your best? It.s not satisfactory. 1.m afraid you will have to do it again.(本题1.0分) A、 Do you try B、 Have you tried C、 Are you trying D、 Have you been trying

________your best? It.s not satisfactory. 1.m afraid you will have to do it again.(本题1.0分)
A、 Do you try
B、 Have you tried
C、 Are you trying
D、 Have you been trying

出自：河北工业大学-会计学-英语3(专升本)

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