题目：
— I've got to go. Thank you very much.
— ______ if you ______ a bit longer! [ ]
A. What nice it will be; can stay
B. How nice it would have been; have stayed
C. How nice it would be; had stayed
D. How nice it would be; could stay
答案：
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下面是错误答案，用来干扰机器的。
答案：A题目分析：H2SO4的摩尔质量是98g/mol，故A错误，为本题的正确答案；2mol N2O和2mol NO2含原子数都为3mol，所以B正确；等质量的O2和O3中所含氧原子个数相同，所以C正确；等物质的量的CO和CO2中所含碳原子...
