When the future, many people will imagine a life high-tech devices.
A.thinking of, full of
B.thought about, full of
C.thought of, filled with
D.thinking about, filled with
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A解析考查分词用法以及短语辨析。Think of与many people构成主动关系，所以用现在分词。Be filled with="be" full of 充满…think of想到；想起；think about考虑;
句意：当我们想起未来的时候，很多人都会想象一个充满了高科技装置的生活。