i ___to get in touch with the manager for the last two hours

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i ___to get in touch with the manager for the last two hours but the line is always busy.
A tried B have tried C had tried D have been trying
the answer is D,tell me why

句义在最近的两个小时里,我一直试图和经理取得联系,但总是占线.
表示“从过去某时开始到现在为止一直持续做某事”应当用现在完成进行时.
eg The rain has been pouring for five hours.
It has been windy for a month.
其余三个选项的时态均不符合要求.

i ___to get in touch with the manager for the last two hours i wish i ___to the concert with you last night! They _____(stay)in the park for two hours last Sunday.怎么做?为什 They ______(stay)in the park for two hours last Sunday. They____(stay) in the park for two hours last Sunday 适当形式填空 He read the book for two hours last night.划线提问（for two hours the manager left two hours ago.the manager____ ____ ____ for I t can help us get in touch with people form all over the w I stayed in the room for two hours yesterday.（对划线部分提问）for tw The woman with two children ( ) for nearly five hours. i'll get in touch with I have at last managed to get two tickets for the cup final.