【题目】“______ your best? It’s not satisfactory. I’m afraid you will have to do it again.” ( )
A.Do you tryB.Have you triedC.Are you tryingD.Have you been trying
【答案】B
【解析】
句意：你尽力了吗？这不令人满意。恐怕你不得不这么做。这句话应该问的是在现在的过去，你是否尽力了，所以用现在完成时，现在完成时更加突出，强调时间对比，从过去到现在的这个努力程度。故选B。
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