A:Was it; that
B:It was; where
C:Is it; that
D:It is; where
汽车发动机的额定功率为30kW,质量为2000kg,当汽车在水平路面上行驶时受到阻力为车重的0.1倍,
① I can play the violin. ____ A. Boom—boom!
② Can you hear my drum? ____ B. Zing—zing!
③ Listen! It's Peter's triangle. ____ C. Ding—ding!
④ I like playing the piano. ____ D. Ting—ting!