蝗虫在由幼虫发育为成虫的过程中要经过几次蜕皮( )
-What does it mean? -It ________ we shouldn't park our cars here. A. mean B. means C. meaning
What________they mean? A. does B. do C. did
-Can I go in? -________ A. No,I don't. B. Yes,I am. C. Yes,you can.
There are ________ public signs in the park. A. a lot of B. lot of C. a lots of
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