Question

【题目】There is a new problem involved in the popularity of private cars __________ road conditions need __________.

A. that; to be improved B. which ； to be improved

C. where ； improving D. when ； improving

Answer 1

【答案】A

【解析】第一空处为that引导的同位语从句；need后面要接to be done或doing表示被动意义。因此A项正确。