They usually spend a lot of time ---(talk)on the telephone.
问题描述：
They usually spend a lot of time ---(talk)on the telephone.
答
talking
spent sometime on doing sth
on可以省略
答
他们通常在通电话上花费很多时间
答
talking
spend 的常用句型：
spend + 时间/钱 + doing sth
spend + 时间/钱 + in doing sth
spend + 时间/钱 + on sth
希望能够帮到你，望采纳！
答
talking
spend time doing sth
答
talking
spend doing
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答
They usually spend a lot of time talking(talk)on the telephone.
spend time doingsth固定词组，花时间做...
有不会的可以再问我