The boy asked his mother ''Does water freeze at 0℃?''(合并句子)

问题描述:

The boy asked his mother ''Does water freeze at 0℃?''(合并句子)
The boy asked his mother _______water ________at 0℃?
一般来说,真理用一般现在时,可是这个男孩问她的母亲,代表不确定,应该用过去式,

whether/if,freezes