单项选择题
It was （） last week（）I knew the news.
A. until... that B. not until... when C. not until... that D. until... since
单项选择题 One of the sides of the board should be painted yellow, and （） white.
单项选择题 （） of years ago, whales lived （） land and walked on four legs.
单项选择题 The flowers are so beautiful that I would do （）I can to save them.
