摘要：33．[2010·陕西宝鸡市质检三]-Have you found the missing couple in the mountain ? -No, but we hard to get in touch with them． A． have tried B．have been trying C．had tried D．had been trying 33B考查动词时态.句意:我们一直在努力和他们联系.根据句意用现在完成进行时.

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