For many years, people () electric cars. H
题型：单项选择题
问题：
For many years, people () electric cars. However, making them has been more difficult that predicted.
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of
For many years, people () electric cars. However, making them has been more difficult that predicted.
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of