单项选择题
As our eating habits changing, choosing what () is no longer as easy as it once was.
A. eat B. eaten C. to eat D. to be eating
单项选择题 关于烟草专卖违法行为，表述错误的是（）。
单项选择题 Nobody knows why there are so few women at the（）of movies.
单项选择题 成釉细胞瘤和成釉细胞纤维瘤在组织病理方面的主要区别是（）
