单项选择题

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

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单项选择题

I have to delay（）the letter.

A. to answer
B. answering
C. answer
D. answered

单项选择题

教学技术的使用必须按照______来决定。

A．教师的意愿
B．学生的偏好
C．学校的安排
D．教学需求

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