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

—How about your trip to Hainan —It couldn't have been ______. Sometimes I went swimming in the sea; sometimes I lay on the sand.

A．so well

B．as bad
C．better

D．worse

单项选择题

Bats are surprisingly long-lived creatures, some ______ a life span of around 20 years.

A. having
B. had

C. have
D. to have

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