we ______(be) there many times before.

好象是have been ,不过你着句子好象不完整用takespendcostpay填空the new type of the air-conditioner_______ much more than the old one.用cost确定吗顺便看一下下面的题目!!!给加分哦两个都是spend有三个呢！！quickly……好了就给分了，速度take第一第二个spend第三个take？？？？对不对啊