题干
—Do you know ________?
—Next month.
A：When will they come
B：when did they come
C：When they came
D：when they will come
答案(点此获取答案解析）
D
—Do you know ________?
—Next month.
A：When will they come
B：when did they come
C：When they came
D：when they will come
N2+CO2+2H2O，则框内物质的化学式是（ ）
