we walked for a________ two hours before we got to the top .

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we walked for a________ two hours before we got to the top .

we walked for a________ two hours before we got to the top .
we walked for a________ two hours before we got to the top .

we walked for a________ two hours before we got to the top .
答案为:
we walked for (another) two hours before we got to the top .
在到达山顶之前,我们又走了2个小时.

we walked for another two hours before we got to the top .