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题目内容
（河北工业大学-英语3）
________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
A、 Do you try
B、 Have you tried
C、 Are you trying
D、 Have you been trying
参考答案