题干
The mother said, “ Be friendly to others.” The mother ____ friendly to others.
A：asked her son be
B：told her son to be
C：ordered her son be
D：told her son be
答案(点此获取答案解析）
B
，则下列结论①
；②
；③MN//平面A1B1C1D1；④
中，正确命题的个数是 （ ）