问题
选择题
—We must thank you for taking the trouble to cook us a meal.
—________.
A．With pleasure
B．It doesn't matter
C．It was no trouble at all
D．By all means
答案
答案：C
C [with pleasure用来回答别人的请求，意为“愿意”；It doesn't matter意为“不要紧”，回答别人的道歉；It was no trouble at all根本不麻烦，在此题中用来间接回答对方的道谢；By all means意为“当然可以，没问题”。]
2KCl+ 3O2↑ 
2Fe+3CO2