Question

【题目】Tom knew nothing ________________ his friend told him.

A. because B. until C. since D. if

Answer 1

【答案】B

【解析】句意：汤姆直到他的朋友告诉他才知道一切。A. because因为；B. until直到……才；C. since自从；D. if如果，是否。knew nothing=didn’t know anything，not…until直到……才。结合句意可知，答案为B。