地中海地区夏季炎热干燥是由于受盛行西风的影响。[ ]
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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
医疗器械不良事件监测的工作环节有哪些？
