题干
Bruce ________ at 6:15 in the morning.
A： brush his teeth
B： brushes his teeth
C： brush his tooth
D： brushes his tooth
答案(点此获取答案解析）
B
Bruce ________ at 6:15 in the morning.
A： brush his teeth
B： brushes his teeth
C： brush his tooth
D： brushes his tooth
”如下：对任意的
，
，令
，下面说法错误的是（ ）
