单项选择题

Hardly ______ when it began to rain.A.had he arrivedB.arrived heC.he had arrivedD.did he arrive

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不定项选择
一质点同时参与两个方向互相垂直的简谐振动，质点的运动轨迹是正弦或余弦曲线．
A．正确
B．错误
单项选择题
The speaker said something about the actor and then _________to talk about the film.A.proceedB.proceededC.startedD.had proceeded
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