先后用万用表R×1K档测某个二极管时，发现正、反向电阻均接近1000千欧，这说明此二极管（）。
A. 短路
B. 开路
C. 完好
D. 无法判断
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The boy _____________ (draw) a picture now.
Look! They ______________ (have) an English lesson.
When he came in, I _______________(read) a newspaper.
When the bell rang, Jenny _______________ (wait) in her seat.
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