题干
This morning my mother asked me .
A：why he is not here
B：where Julia went last weekend
C：what time is it
D：how did my brother do it
答案(点此获取答案解析）
B
This morning my mother asked me .
A：why he is not here
B：where Julia went last weekend
C：what time is it
D：how did my brother do it
不能产生NMR现象( )