Question

【题目】 It’ll be another 50 years _________ China is expected to reach the level of a medium developed country.

A. since B. before C. that D. when

Answer 1

【答案】B

【解析】

试题分析: 句意：预计还要再过50年中国才能赶上中等发达国家的水平。固定句型：It will be +时间段 +before 从句，意思是“还要多久才能”，选B。