.
Playing with a cell phone, he suddenly ________ the teacher staring at him.
A．knew ofB．became aware of
C．reflectedD．a(chǎn)ware for
B
考查短語辨析。knew of 了解，became aware of 意識到，reflected 反映，句意：他在玩手機，他突然意識到老師正在盯著他。所以選B。
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