MillieandKittyaregoodfriends,theyoften

问题详情：

Millie and Kitty are good friends, they often _________ each other _________study.

A、helping; with                             B、help; to

C、helping; to                               D、help; with

【回答】

D

知识点：动词和动词短语

题型：选择题