A: I once heard someone shout, "Look out." I put my heard out of the window and a bucketful water fell on me. It seems that "Look out" may mean "Don't look out". B: I was once on a ship and heard the captain shout, "All hands on deck ." I put my hands on the deck and someone walked on them. C: I once called early on an English friend and the servant who came to the door said, "He's not up yet. Come back in half an hour." When I went again for him, she said, "He's not down yet." I said, "If he's neither up nor down. Where is he?" . The writer writes the dialogue to tell us that   _  .
English is very interesting if you like it and keep on using it it is impossible to learn English very well in a short time language keeps on developing and changing all the time words and phrases may have different meanings in different situations.
Question: A: I once heard someone shout, "Look out." I put my heard out of the window and a bucketful water fell on me. It seems that "Look out" may mean "Don't look out". B: I was once on a ship and heard the captain shout, "All hands on deck ." I put my hands on the deck and someone walked on them. C: I once called early on an English friend and the servant who came to the door said, "He's not up yet. Come back in half an hour." When I went again for him, she said, "He's not down yet." I said, "If he's neither up nor down. Where is he?" . The writer writes the dialogue to tell us that   _  .
A. English is very interesting if you like it and keep on using it
B. it is impossible to learn English very well in a short time
C. language keeps on developing and changing all the time
D. words and phrases may have different meanings in different situations.
Answer: