________no bus, we had to walk home.
A. There is
B. There being
C. As there being
D. There be
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________, the text became easier for us to learn.
A. New words explained
B. New words being explained
C. New words are explained
D. New words was being explained
Father came back, _______ a bag of money on his left shoulder.
A. he carried
B. he carrying
C. carrying
D. and carrying
二阶系统起调量与阻尼比有关吗？
A. 有
B. 没有
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