my brother and i often do our homework for 70 minutes(同义句转换）my brother and i often do our homework for ___ ___ ___ ___
问题描述：
my brother and i often do our homework for 70 minutes(同义句转换）
my brother and i often do our homework for ___ ___ ___ ___
答
只能填入：
My brother and I often do our homework for 70 minutes.
=My brother and I often do our homework for (more than an/one hour).
注：/表示可以任意选用其一.