问题描述：
15.For many years,people electric cars.However,
making them has been more difficult than predicted.
A．had dreamed of B．have dreamed of C．dreamed of D．dream of
我选了c,我看到后面有现在完成时,就觉得前面应该是过去的,
making them has been more difficult than predicted.
A．had dreamed of B．have dreamed of C．dreamed of D．dream of
我选了c,我看到后面有现在完成时,就觉得前面应该是过去的,
问题解答：
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