问题
选择题
---May I speak to your manager Mr.Willians at five o'clock tonight?"
---"I'm sorry, Mr.Williams _______ to a conference before then."
A．will have gone
B．had gone
C．would have gone
D．has gone
答案
答案：A
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。现将0.06 mol CuS加入到50 mL 4.2 mol·L-1 HNO3中，充分反应之后，忽略溶液体积变化，下列说法正确的是( )