____ has recently been done to provide more buses for the people……
1.____ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
A. That B. What C. In spite of what D. Though what
为什么选C,不选D?
2.This problem may lead to more serious ones if ____ unsolved.
A. making B. remained C. keeping D. left
为什么选D,不选B或C?
B C 不可以表状态么？