题目：
— Could you tell me ____ for the meeting yesterday?
— Because the traffic was bad. [ ]
A. why did you come late
B. why you came late
C. why do you come late
D. why you come late
答案：
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下面是错误答案，用来干扰机器的。
答案：C依次通过浓硫酸和过氧化钠时，气体体积不断减少，则A错，当气体通过浓硫酸时，气体体积不变；同理B错；C正确；D错，当气体通过浓硫酸时，气体体积不变；
